Instructions: 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").
Input: Weathering is (A) wheat growing in a field (B) peat moss growing on river rocks (C) air plants growing in a shell (D) a dandelion growing thru a line in asphalt
Output:
D