If you are having trouble answering the questions, it's possible there is erroneous information on your credit reports. I'd suggest going to www.annualcreditreport.com (it's the legit federally backed site) and grab each of your credit reports. That will provide you with any/all information that coinbase could ask about as well as show you if there is any wrong information being kept.

I had to do this as well because I moved a lot while in the military and couldn't remember some of my old addresses which coinbase asked about.