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: The cultivation of a range of crop types in a specific order has a positive impact on (A) soil quality (B) water quality (C) air quality (D) atmospheric conditions

Output: A


Input: Consider Input: A thermal insulator slows the transfer of what? (A) warmness (B) light (C) energy (D) liquid

Output: A


Input: Consider Input: It is possible to renew (A) sunflowers (B) oil (C) steel (D) stones


Output: A