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").

[Q]: Teak can be found in (A) glacier sheets (B) blue songs (C) groves (D) underwater trenches
[A]: C


[Q]: pushing against a rolling boulder will decrease its (A) size (B) height (C) impetus (D) ambitions
[A]: C


[Q]: audible vibrations can travel freely through (A) a brick (B) nitrogen and oxygen (C) the ground (D) a mountain
[A]:
B