You will be given a definition of a task first, then some input of the task.
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: erosion of soil has a negative impact on the environment, Fact2: Forests provide a clean and comfortable environment., Question: Erosion of soil has what impact on a forest? (A) mechanical (B) negative (C) helpful (D) wind (E) healthy (F) forces (G) positive (H) flooding
Output:
B