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").
Problem:Fact1: a valley is formed by a river flowing, Fact2: Rivers cause erosion by transporting weathered rock and soil downstream., Question: What are created through erosion? (A) kalenchoes (B) Roads (C) Valleys (D) Mountains (E) Volcanoes (F) Stalactites (G) flooding (H) loose soil
Solution:
C