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

question:
migration is when animals travel from the northern most state to Texas during what segment of time? (A) lake fronts (B) birds (C) winter (D) spring
answer:
C

question:
Unlike CO2, oxygen is a waste product of (A) the moon (B) rocks (C) cactus (D) hair
answer:
C