instruction:
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").
question:
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
answer:
B


question:
Grooves in the ground are a sign of (A) sink holes (B) erosion (C) water accumulation (D) high traffic
answer:
B


question:
If the sun has set it is (A) easy to cook a meal (B) time to eat breakfast (C) necessary to wear a coat (D) harder to see outside
answer:

D