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: Solar energy is adsorbed by (A) planted flowers under the moonlight (B) potted flowers in a windowless room (C) planted flowers on a bright, clear day (D) seeds that have just been planted in the ground
Example Output: C

Example Input: Amphibians undergo changes in structure of being in that (A) salamanders can regrow their tails (B) salamanders can lose their tails (C) frogs can breathe air and water (D) they begin as a different looking being
Example Output: D

Example Input: Which would likely be the biggest factor in climate change? (A) bees (B) glaciers (C) bicycles (D) factories
Example Output:
D