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: 2000 years ago, this method would likely have brought sand from the coast to the desert (A) the pyramids often eroded, making their own sand (B) constant breezes over time (C) human automobiles transfer materials (D) the space shuttle moved sand great distances

Output: B


Input: Consider Input: If a leg is moving then the bones inside the skin are (A) being controlled by brawn (B) being slowly softened up (C) being made to break down (D) being torn into pieces

Output: A


Input: Consider Input: Refraction (A) makes objects appear to be twice their size (B) moves heat energy thru sound waves (C) is the phenomenon involved in mirrors (D) makes a straw appear broken when in a cup of water


Output: D