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: Moisture levels before planting and flowering have the greatest impact on yield., Question: Seed dispersal has a what on flowering and yield? (A) Reproduction (B) positive impact (C) lack of impact (D) genetic diversity (E) gene flow (F) neutral impact (G) population movement (H) negative impact
A:
B