Given the task definition and input, reply with output. 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: rain causes erosion, Fact2: Erosion and landslides are common., Question: What can be caused by rain? (A) landslides (B) Water expanding (C) deforestation (D) salinity (E) vaporization (F) flooding (G) Pollution (H) contamination
A