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]: 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 A]: D

[EX Q]: Your body goes into starvation mode when you insufficient amounts of (A) shoes (B) fun (C) pants (D) sustenance
[EX A]: D

[EX Q]: Which is a cause of greenhouse gases? (A) elephants (B) pears (C) boulders (D) oaks
[EX A]:
A