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: Due to the drought, there is no water., Question: What can change the color of an environment from green to brown? (A) the ocean (B) a lack of water (C) rain (D) harmful substances (E) sleet (F) deforestation (G) Greenhouse gases (H) Greenhouse gasses
A:
B