Q: 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").
Fact1: contact between rocks over long periods of time causes rocks to smooth, Fact2: Sandstone, shale, and limestone are sedimentary rocks., Question: what is smoothed by contact over long periods of time? (A) shale (B) earth (C) eras (D) Roads (E) soils (F) water (G) clouds (H) ground
A:
A