Given the task definition, example input & output, solve the new input case.
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: Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Output: C
This is a good example and the output correctly answers the question.

New input case for you: What are sources of shelter for small animals? (A) andesite (B) wind (C) sun (D) air
Output:
A