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:
Obstacles that might impede a dune are (A) God (B) emotions (C) cacti (D) cancers

Ex Output:
C


Ex Input:
A big cat looks for prey (A) at 3pm (B) at 11pm (C) at 9am (D) at noon

Ex Output:
B


Ex Input:
Which is the source of a nonrenewable resource? (A) rain (B) the wind (C) the Sun (D) oil deposits

Ex Output:

D