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: A skill some humans have is (A) ten fingers (B) vision (C) heart beating (D) talking
Example Output: D

Example Input: What is an example of protecting the environment? (A) flushing the toilet twice (B) using water flow limiter (C) driving shorter trips more often (D) using fancy, more expensive paper
Example Output: B

Example Input: the energy of the ocean can be harnessed to charge a battery that eventually powers a (A) cupcake (B) rock (C) nosehair trimmer (D) tree
Example Output:
C