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
Example solution: C
Example explanation: This is a good example and the output correctly answers the question.

Problem: What is the use of organisms preserved in sedimentary rock? (A) clothing (B) water (C) food (D) fuel

Solution: D