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").

Ex Input:
Why is it fall one month and spring another month? (A) the moon has different phases (B) the earth is revolving (C) solar flares appear in cycles (D) the earth is in a different place in its orbit

Ex Output:
D


Ex Input:
the presence of which of these is required for the formation of cavernous chambers? (A) some carbonated soda (B) some carbon dioxide (C) some carbonic acid (D) carbon monoxide gas

Ex Output:
C


Ex Input:
Which is likeliest to harm the snowy owl population in an area? (A) a new mall (B) a new puddle (C) a new tree (D) a new preserve

Ex Output:

A