Which sentence uses a second person pronoun?

AWhat did you cook for dinner yesterday?
BI got stuck in terrible traffic this morning.
CThe best part about an e reader is that it can hold so many books.
DThe fish swarm circles around each other.

Verified Answer :

second person pronoun is you in object pronoun, you in subject and yours in possessive, so 
a is the answer
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The answer is A what did you cook for dinner yesterday?