I'm not sure what the lesson is, but the answer that makes sense the most is number. Number because most lessons in subject-verb agreement concerns the singularity and plurality of the subject at hand
Are you juman ? is a good one
The correct answer is B.
The men know his name before they have been introduced. They have been watching the chase on TV and have been expecting Montag to show up.
They give him a drink that helps him escape the Hound, and the Hound eventually gets someone else, allowing everyone to think it was Montag.
The answer is D because that’s the only one that’s not right