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").
Q: Fact1: soil is formed by rocks eroding, Fact2: Soil Erosion Soil erosion is a natural process., Question: What will rocks all do? (A) Bend (B) Erode (C) Melt (D) die (E) Dance (F) Run (G) survive (H) expand
A:
B