Detailed Instructions: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Problem:It is easiest to get a clear photo of the moon by (A) using a large magnifying glass (B) using a telephoto lens (C) using a telescopic lens (D) looking through a microscope
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
C