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: acid rain has a negative impact on water quality, Fact2: Plants are sensitive to acid rain., Question: What are sensitive to water quality? (A) conditions (B) salmon (C) plants (D) clams (E) frost (F) trout (G) stones (H) mussels
A:
C