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:
Grooves in the ground are a sign of (A) sink holes (B) erosion (C) water accumulation (D) high traffic

Ex Output:
B

Ex Input:
Which event can lead to the human caused change of an environment? (A) seasonal storms (B) annual flooding (C) natural woodland fires (D) clear cutting

Ex Output:
D

Ex Input:
How can H2O on the ground eventually rise into the sky? (A) freezing (B) raining (C) snowing (D) evaporation

Ex Output:
D