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: Chlorophyll is good for allowing plants to absorb energy and (A) is dry (B) is dead (C) is clear (D) is healthy
Example Output: D

Example Input: A system of tubes that relocates water and nutrients around in order to make most use of them can be found in (A) a lily (B) a door (C) a table (D) a rock
Example Output: A

Example Input: Greenhouses (A) trap the dangerous gases released by plants (B) protect plants from snow and frost (C) keep plants from getting warm (D) protect plants from mild weather
Example Output:
B