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 is competition? (A) a giraffe eats the highest leaves (B) a bear takes a salmon from the stream (C) a shark eats a tuna that an orca was hunting (D) a slug eats a blade of grass

Ex Output:
C

Ex Input:
Which is likely to spread seed? (A) a car (B) a sun beam (C) a whale (D) a hummingbird

Ex Output:
D

Ex Input:
National parks have rules (A) that curtail the growth of fragile animal species (B) that open the parks to mining of natural resources (C) that allow for littering (D) that protect vulnerable animal inhabitants int he parks

Ex Output:
D