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: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What can cause rocks to break down? (A) Wind Barriers (B) Protective Barriers (C) Stone Sealers (D) wind (E) mines (F) Water (G) erosion (H) Gravity
A:
F