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 student leaves a nail line on a mineral sample, so that mineral can be described as what? (A) a mineral (B) a soft mineral (C) a liquid mineral (D) a mineral melt
Example Output: B

Example Input: You are unable to naturally make yourself taller because height is determined by (A) parents (B) Cookies (C) Space (D) Eggshells
Example Output: A

Example Input: Cutting down trees has a negative impact on what living in an ecosystem? (A) disks (B) plans (C) stone shelves (D) critters
Example Output:
D