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").

Input: Consider Input: An early example of harnessing wind power would be (A) unicorns (B) santas flying reindeer (C) trumps windy speeches (D) cloth on masts

Output: D


Input: Consider Input: A light is refracted when (A) it shines at a gem (B) it shines at a mirror (C) it reflects off a spoon (D) it reflects off a car

Output: A


Input: Consider Input: An burrowing frog breaks through the mud after it's done (A) slumbers for years (B) migrating (C) moving indoors (D) being exported


Output: A