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]: What becomes smoother through weathering? (A) rainbow (B) water (C) cat (D) pumice
[EX A]: D

[EX Q]: Drinking cola daily removes layers from the surface of (A) enamel on molars (B) spoons (C) porcelain (D) the coffee pot
[EX A]: A

[EX Q]: Several animals flourish in cold temperatures like (A) Lizards (B) Terns (C) Antelope (D) Kangaroos
[EX A]:
B