Answer:
D:When choosing your topic
Explanation:
C. prepostion
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause, as in “the man on<span> the platform,” “she arrived </span>after<span> dinner,” “what did you do it </span>for<span> ?”</span>
Answer: A, Yes.
Explanation: The subject, brother, and the verb, does, agree with each other.