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: air pollution can cause the pH of soil to decrease, Fact2: Acidity increases as the pH number decreases, and alkalinity increases as the pH number increases., Question: What can increase soil acidity? (A) Air pollution (B) Organic compounds (C) humans disturb it (D) cactuses (E) flooding (F) deforestation (G) Pollution (H) harmful substances
A:
A