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: rain causes erosion, Fact2: Erosion sculpts the landscape, creating fantastic rock formations., Question: Rain causes what and sculpts landscapes? (A) stone filtering (B) rock formations (C) water stagnating (D) rock growing (E) alluvial (F) flooding (G) coastlines (H) permineralization
A:
B