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: Consumers eat other what? (A) oxygen (B) animal toys (C) rays (D) weaker bugs
Example Output: D

Example Input: Which is likely to provide an undesired acquired characteristic for an organism? (A) a light scratch on its leg (B) learning to leave the nest (C) finding a potential mate (D) dipping a foot in magma
Example Output: D

Example Input: What is a source of energy for animals? (A) grains (B) air (C) space (D) sunlight
Example Output:
A