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 are a source of fibers? (A) water (B) plantlife (C) rocks (D) air
[EX A]: B

[EX Q]: a student leaves a nail line on a mineral sample, so that mineral can be described as what? (A) a mineral (B) a soft mineral (C) a liquid mineral (D) a mineral melt
[EX A]: B

[EX Q]: When observing animals in the wild, which of these are you most likely to see? (A) A frog stalking a rabbit (B) A bear sticking its claws in the river (C) A wolf hunting an eagle (D) A tiger hunting a dolphin
[EX A]:
B