Definition: You are given a question on astronomy. Astronomy is a natural science that studies celestial objects and phenomena. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: If the Moon is setting at noon the phase of the Moon must be
(A)third quarter. (B)waning crescent. (C)waxing crescent. (D)full.

A