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
I'd assume they are referring to the metaphor of "you" being a "gray cat" or "quiet street."
Answer:
I am not sure EXACTLY which one but it is either 1 or 4
Explanation:
Sorry I couldn't help :(