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").

Input: Consider Input: Riding a two wheeled human powered vehicle is good for the environment because (A) it runs without fuel (B) it helps people stay in shape (C) they are cheaper to maintain (D) they are more fun to drive

Output: A


Input: Consider Input: Rocket engines can lift rockets because (A) of how much fuel they use (B) of how fast they are (C) of the power the hit the ground with (D) of how tall they are

Output: C


Input: Consider Input: To have a positive impact on the environment (A) leave lights on (B) take shorter showers (C) use Styrofoam plates (D) take longer showers


Output: B