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: Using mirrors to focus collected light from heavenly bodies allows (A) detailed observation (B) foregone conclusions (C) radiation experiments (D) celestial music
Example Output: A

Example Input: If a tree in your backyard rots away for is knocked over by the wind, you can just (A) plant another (B) Draw one (C) climb one (D) do nothing
Example Output: A

Example Input: When would a habitat be considered destroyed? (A) all trees have been razed (B) the lake is overflooded (C) the desert experiences high winds (D) the tundra's average temperature increases slightly
Example Output:
A