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:
A light is refracted when (A) it shines at a gem (B) it shines at a mirror (C) it reflects off a spoon (D) it reflects off a car

Ex Output:
A


Ex Input:
How is a place of lower elevation affected by flooding when compared to a higher location? (A) It is more affected by the flood (B) It is impossible to flood a lower elevation location (C) It is more resistant than a higher place (D) The lower area is already flooded

Ex Output:
A


Ex Input:
As a pond is slowly evaporated, the food for ducks in that area (A) is tasteless (B) is more (C) is booming (D) is less

Ex Output:

D