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: An object converts electrical energy into sound on a (A) iphone (B) soft carpet (C) outside wall (D) wooden table

Output: A


Input: Consider Input: Which of the following would you use to most efficiently transport heat? (A) empty water bottle (B) cotton T-Shirt (C) baseball cap (D) empty soda can

Output: D


Input: Consider Input: Gasoline is unable to exist without the addition of raw materials such as (A) fossilized matter (B) sand (C) water (D) air


Output: A