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 Q]: Adding something poisonous to an environment and harming it is called what? (A) dirtying (B) liking (C) cleaning (D) observing
[EX A]: A

[EX Q]: What needs measurements taken in the morning and evening? (A) coastal range (B) tidal range (C) wave length (D) apex
[EX A]: B

[EX Q]: What is oil likely comprised of? (A) homo sapiens (B) air (C) soil (D) brontosaurus
[EX A]:
D