Q: 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 causes a river to become deeper and wider, Fact2: Canyon formed as a consequence of river erosion., Question: rivers cut deeper and wider to form what (A) canyons (B) arteries (C) Roads (D) timberlands (E) old growth forests (F) soils (G) Sediment (H) coral reefs
A:
A