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").

Fact1: darkness has a negative impact on photosynthesis, Fact2: Plants use photosynthesis to make food., Question: What negatively affects plant life? (A) toxins (B) darkness (C) fertilizer (D) water (E) Pesticides (F) Smoking (G) Pollution (H) sunlight
B