[ Grammar ]
Which one is correct?
A. You should decide which one of the three choices A, B, or C best answer the question.
B. You should decide which one of the three choices A, B, or C best answering the question.
C. You should decide which one of the three choices A, B, or C best answers the question.
D. You should decide which one of the three choices A, B, or C best are answer the question.

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Grammar › ViewWhen you (arrive) at the party, who (be) there?
A. arrived / was being
B. arrived / was
Grammar › View
You’re coming to the party,
A. aren’t you?
B. isn’t you?
C. are you?