The answer is C: It asks the reader a question.
A thesis statement is a concise phrase, usually one sentence, that lets the reader know how the writer will interpret the subject matter being discussed.
It creates a map or itinerary, so to speak, that the writer will follow throughout the text in supporting his or her claim. This claim is meant to be either disputed or conceded by the reader. The thesis statement, as such, does not ask anything particular to or of the reader.