If applied for removal of conditions and they sent me a letter asking for more evidence to see if my marriage was bonafide, what should I send?

You should send them any and all documents that tends to show the bona fides of your marriage. Relevant documents are those that you obtained within the last 2 years, or after you got your first green card. The documents will depend on the circumstances of your married life as a couple and will vary from one marriage to the next. You must be very careful of the kinds of documents you submit. A document that shows that your marriage is legitimate may also create problems if they establish unfavorable information that may negatively impact your case. You must therefore consider hiring an attorney to help you sort things out.

You have to submit evidence that shows that your marriage is bona fide. If you are not sure of what or how to submit the evidence, you should consult with an immigration attorney.

You should send all of that, plus whatever else they list in the letter. You can also hire a lawyer to assist in the process.

Send in copies of any documents with both names on them.