Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Problem:Fact1: rocks interacting with wind over long periods of time causes weathering, Fact2: Winds grind down rocks., Question: What grinds rocks over time? (A) deltas (B) erosion (C) Time and energy (D) weathering (E) Echinoderm. (F) deuterostomes (G) amoebae (H) bullfrogs
Solution:
D