Definition: 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").
Input: Fact1: Running water is better able to dissolve oxygen and nutrients than standing water., Fact2: Mineral nutrients are interrelated., Question: Running water is able to do what to minerals and oxygen? (A) evaporation (B) dissolve them (C) reducing acid rain (D) recycling (E) clean them (F) separate them (G) hydration (H) cool them
Output:
B