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:
What does gravity cause substances on a planet? (A) things to move sideways (B) things to be moved upwards (C) things to descend to the lowest surface possible (D) things to stay in the same place

Ex Output:
C


Ex Input:
What becomes smoother through weathering? (A) rainbow (B) water (C) cat (D) pumice

Ex Output:
D


Ex Input:
a flood is occurring there was most likely (A) light hail (B) clear skies (C) some leaves (D) great drops repeating

Ex Output:

D