The change which should be made to correct this sentence is B. capitalize you.
The reason why this should be done is because it is the beginning of a new sentence. Everything included within quotation marks is a new sentence, which obviously should begin with a capital letter.
Answer:
She is the author of the novels Purple Hibiscus, which won the Commonwealth Writers' Prize and the Hurston/Wright Legacy Award; Half of a Yellow Sun, which won the Orange Prize and was a National Book Critics Circle Award Finalist and a New York Times Notable Book; and Americanah, which won the National Book Critics ...
Explanation:
"If you ask her", is an adverb clause because it starts will the adverb "if" and it can modify verbs, adverbs, and adjectives by telling when, where, why, how/how much, and under what condition.