Q: 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: landfills have a negative impact on the environment, Fact2: An ecosystem is an environment and all the members of that environment., Question: What do landfills have a negative impact on? (A) The atmosphere (B) Ecosystems (C) earth (D) animals (E) Impact crater (F) Garbage (G) humans (H) Refuse containers
A:
B