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: Which of the following actions can make electrical energy brighten your room? (A) Clap on! (B) Jumping in place (C) Turning a doorknob (D) Rubbing your nose

Output: A


Input: Consider Input: An echo is produced by what type of reflection of sound source? (A) Direct (B) Distant (C) Varied (D) Single

Output: D


Input: Consider Input: The outer casing of a tree expands how many times a year (A) 1000 times (B) ten times (C) once (D) 100 times


Output: C