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]: Which of the following has a population of zero? (A) Merriam's elk (B) bison (C) llama (D) whooping crane
[EX A]: A

[EX Q]: something in a cold place becomes what? (A) warmish (B) toasty (C) hot (D) chilly
[EX A]: D

[EX Q]: electrical current does what to a wire to cause it to heat up (A) carry it (B) merge with it (C) run from it (D) traverse it
[EX A]:
D