Teacher: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").
Teacher: Now, understand the problem? Solve this instance: Fact1: contact between rocks over long periods of time causes rocks to smooth, Fact2: Metamorphic rocks are rocks formed by the alteration of preexisting rocks deep within the Earth., Question: what between objects formed deep within the Earth causes them to smooth (A) Movement (B) loose soil (C) erosion (D) contact (E) soils (F) break off (G) friction (H) Bend
Student:
D