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: Which most likely requires the aid of specialized tissues at the ends of stems? (A) human assisted space travel (B) the quick growth of bamboo (C) cats digging with their claws (D) the slow growth of mammals

Output: B


Input: Consider Input: if something is outside during the day then that something will receive what? (A) astral beams (B) steam (C) gratitude (D) night light


Output: A