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:
Which of these could be a reason why the stars seem to be in a different place at dusk than at dawn? (A) rotation of the sky (B) rotation of the sun (C) rotation of the earth (D) rotation of the person

Ex Output:
C


Ex Input:
A person can get sick when eating a vegetable if it was farmed using (A) water (B) dirt (C) insect destroyers (D) tools

Ex Output:
C


Ex Input:
Caribbean natives have a dark skin tone do to (A) unicorns (B) solar radiation (C) lack of nutrients (D) camouflage

Ex Output:

B