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:
How does erosion impact a river? (A) enlargening (B) warming (C) heightening (D) shrinking

Ex Output:
A


Ex Input:
Sleet is made out of water that is (A) vapor (B) hot (C) liquid (D) cold

Ex Output:
D


Ex Input:
Our only satellite is found with the other (A) nine planets (B) nebula (C) red giant stars (D) Andromeda galaxy

Ex Output:

A