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 does light from the sun arrive at in final time length? (A) Uranus (B) Mars (C) Pluto (D) Earth

Ex Output:
C


Ex Input:
What is an example of protecting the environment? (A) flushing the toilet twice (B) using water flow limiter (C) driving shorter trips more often (D) using fancy, more expensive paper

Ex Output:
B


Ex Input:
A source of something supplies that something, like how (A) clouds are a cloud source (B) ponds are a moisture source (C) air is a air source (D) fish are a fish source

Ex Output:

B