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]: if the surface of our planet is different after a while, what could have happened? (A) the surface eroded on its own (B) all of these (C) there were natural occurrences (D) man has damaged the surface
[EX A]: B

[EX Q]: A thing which moves very little over quite a lot of time is a (A) pack of wolves (B) racing horses (C) falling rocks (D) giant ice brick
[EX A]: D

[EX Q]: what creates no pollution? (A) natural fuel like coal or gas (B) mills that makes energy from the wind (C) buildings that make large quantities of items (D) transportation contraptions with four wheels
[EX A]:
B