Good morning! Sorry that you got the dreaded RFE. Question - did you not originally submit the marriage termination document?
Regarding the Affidavit of Support - were you well above the poverty guidelines? I follow an immigration attorney on YouTube who does live call-in shows for people to get answers to their immigration problems - if you're interested I'll send you the link. A lot of people call in with Affidavit of Support issues and he always says that if you're not well above the poverty guidelines, you should get a co-sponsor. That's just how NVC is - even though they have guidelines, they sometimes ask for more. Same thing with the documents - they give you a list of what you need to submit but then they send an RFE for something that wasn't even on the list. It's frustrating but you'll get there.