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: If something is in an ecosystem, it could be (A) invisible (B) vacuum of space (C) lacking life (D) alien

Output: C


Input: Consider Input: Lucy left a pan half full of water in the sun and it dried up in one afternoon. (A) the pan was in the cool shade (B) a squirrel dumped the water of its head to cool off (C) butterflies drank it all (D) it was the summertime

Output: D


Input: Consider Input: An example of tool use is (A) mankind's closes relative using a stick to get ants out of a hole (B) a person throwing a hammer into a pool (C) a bird building a nest (D) someone looking at screwdrivers in a store


Output: A