The American Opportunity Credit used to be called the Hope Credit about 10 years ago. If you are confused about the question, you haven't taken the Hope Credit.
The American Opportunity Credit is for education expenses. However, the credit is limited to being claimed for 4 years. If you have been in school for years prior to 2018, it is possible that either you (or perhaps your parents) have claimed the American Opportunity Credit before.
But that question is to help determine if you are eligible to claim the American Opportunity Credit, or if you might qualify for the Lifetime Learning Credit instead. Here's an FAQ that discusses both credits: https://ttlc.intuit.com/replies/3301953
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