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]: 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]: A guy wants to be able to remember the evening. He can be sure that he has a visual and audio backup of the night by (A) bringing his camera (B) bringing his son (C) bringing a drink (D) bringing a chair
[EX A]: A

[EX Q]: Skunks are an animal which has a stink sack, which means that (A) it is unable to smell (B) it births live young (C) other creatures avoid it (D) it is a predator
[EX A]:
C