Form I-485

There is no requirement that you must be in the United States when your green card is filed. It can be filed while you are still outside the United States.

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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.

1. The reply is “No”. They cannot because employer B’s EB-3 was inherited by employer C, and you never filed a I-485 so that cannot be used.

2. Either go back to the first employer if they have a job offer. You can actually apply for a I485 without joining but this should be discussed with your lawyers in detail. Hence you could file for a I-485 based upon the job offer and I-140 which was approved through employer A but if you want to stick with employer C either you stick with EB-3 or you start another PERM application through them for your EB-2 categorization.

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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.

1. The answer is yes. USCIS has made it clear that even if you have used the advanced parole the center will still allow you to do your interfiling as long as the dates for final action dates are current. Please refer the blog for more information: https://immigration.com/blogs

2. According to the USCIS you may only do so once. Although I don't know why I think it's improper enforcement of law and procedure but that's what the USCIS has said. Therefore, it is still possible, but you cannot interfile. However, in my view you can always file another I-485 to also activate the EB-3 from which you have already taken out the pre-existing I-485. Hence, I do not see any problem with filing a second I-485.

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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.

The answer is yes on both counts. The law does not require you to hold the green card job presently. Talk to your lawyers about it and make sure everything else is in order. However, if someone is outside the U.S. he or she can continue to process his or her green card.
 

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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.

1. Your obligation is complete when the government physically receives your papers with the proper filing fees. After that, if they delay in creating the receipt it's really not your problem. As long as you can show that the papers were sent and received by the government. 
2. The answer is No. Let's say that they did leave, then they’re I-130 would still go on but their I-485 would be abandoned and you would have to convert the case to consular processing. 
3. They are automatically eligible to stay because once their I-485 is timely filed, they are considered to be an authorized period of stay. They cannot be illegal as long as the I-485 is pending.  
 

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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.

Since you have already entered and resumed the same job you are still considered to be on H-1B. There is nothing to get back to.
Yes, you can. Although you have traveled on advance parole you should be able to file EB-2 interfiling. 
For more information you can also visit my blog:
https://immigration.com/blogs/adjustment-status-transferring-basis-i-48…
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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.