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: an animal needs to burn complex carbohydrates to (A) stay up (B) move (C) sit (D) sleep
Example Output: B

Example Input: A bird is about to lay an egg, so it needs to construct a safe, round place to place the egg in. The bird constructs using (A) sticks (B) gum (C) rocks (D) tape
Example Output: A

Example Input: When the weather changes as it does from Christmas to Easter, (A) the air may chill (B) the ground may freeze (C) the plants may die (D) the ground may warm
Example Output:
D