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: cutting down trees has a negative impact on an ecosystem, Fact2: Plants include trees., Question: Doing what to plants has a negative impact on the ecosystem? (A) planting them (B) deforestation (C) cutting them down (D) Pesticides (E) watering them (F) massive damage (G) sitting under them (H) Abnormal cell growth
A:
C