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

[EX Q]: Solar energy is adsorbed by (A) planted flowers under the moonlight (B) potted flowers in a windowless room (C) planted flowers on a bright, clear day (D) seeds that have just been planted in the ground
[EX A]: C

[EX Q]: over a period of three years, a farmer cultivates, corn, millet and potatoes. What is this exemplary of? (A) An amateur farming practice (B) a way to gain attention (C) a manner of rotating (D) a way to confuse spectators
[EX A]:
C