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: a drought can change the color of an environment from green to brown, Fact2: Too little rain causes a drought., Question: Too little of what can change the color of an environment from green to brown? (A) pool water (B) energy (C) bath water (D) Acids (E) algae (F) heat (G) water hose (H) rain
A:
H