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: Animals adapt to their what? (A) appearance (B) feet (C) skin (D) nature places
Example Output: D

Example Input: A person wants their yard to be a wonderful ecosystem for local wildlife. They consider doing a few things in order to facilitate this, but ultimately decide that the best way to make a great impact is to (A) make some more money (B) plant a wet rope (C) plant a blue spruce (D) sing to their flowers
Example Output: C

Example Input: Gravity effects water most when it is (A) on a curved surface (B) full of marine life (C) flowing rapidly with waves (D) in the ocean or lake
Example Output:
A