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").

Example Input: A boy is waiting to see a full moon. He notes that the full moon is tonight, and looks at it. If he wants to see another, he must wait (A) a week (B) a day (C) a fortnight (D) a month
Example Output: D

Example Input: What does gravity cause substances on a planet? (A) things to move sideways (B) things to be moved upwards (C) things to descend to the lowest surface possible (D) things to stay in the same place
Example Output: C

Example Input: In order to make a spiral notebook, it is imperative to use (A) rubber (B) plastic (C) trees (D) cows
Example Output:
C