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:
Why is it fall one month and spring another month? (A) the moon has different phases (B) the earth is revolving (C) solar flares appear in cycles (D) the earth is in a different place in its orbit

Ex Output:
D


Ex Input:
Which likely increased atmospheric CO2 recently? (A) sustainable fisheries (B) electric cars (C) motorcycles (D) ant populations

Ex Output:
C


Ex Input:
A product that comes from the ground is likely (A) Styrofoam containers (B) an organic banana (C) wax candles (D) storm clouds

Ex Output:

B