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: Once the grounds frost over and the air grows chilled (A) beaches are opened (B) humans go naked (C) birds lay eggs (D) roses die
Example Output: D

Example Input: What displays the movement of electrons from the base atoms? (A) venus (B) mercury (C) plasma star (D) pluto
Example Output: C

Example Input: There are many changes that can occur to the earth, quickly or overtime. Which would occur over millions of years? (A) earthquake (B) canyon (C) tornado (D) Tsunami
Example Output:
B