It is prudent to use an attorney, especially at times like this. Have everything the officer requested. Also, I would try to reach a professional immigration practitioner prior to your interview.
No. Cannot guess.
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No, it is difficult to guess as to what you signed.
Take an attorney with you. There is 'more' to this officer's suspicions than-meets-the-eye.
He could be 'setting you up' for a major denial.
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I suggest that you contact an attorney and hopefully the attorney can gain access to what you signed. My colleagues are correct when they say it is prudent to have an attorney with you.