Detailed Instructions: 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: planting trees has a positive impact on an ecosystem, Fact2: Thus one important job the squirrel does in the ecosystem is to plant trees., Question: What kind of effect does a squirrel have on the ecosystem? (A) Negative (B) Positive (C) adding heat (D) growth (E) food (F) Destructive (G) Powerful (H) support
A:
B