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: seed dispersal has a positive impact on a plant, Fact2: Seed dispersal is usually by birds., Question: Which can have a positive impact on plants? (A) Nutrient deprivation (B) Brown rot (C) trees (D) Birds (E) colors (F) Drought (G) wind (H) LEDs
A:
D