Teacher: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").
Teacher: Now, understand the problem? Solve this instance: Fact1: acid rain has a negative impact on water quality, Fact2: Acid rain has a pH below 5.6., Question: What has a negative impact on water quality? (A) rain (B) harmful substances (C) rain below 5.6 pH (D) sleet (E) fossil fuels (F) Burning fuel and air (G) snow (H) decaying trees
Student:
C