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: when a river floods , that river deposits soil in flood plains, Fact2: Major river is the Colorado river., Question: what deposits soil in flood plains when it floods? (A) the Colorado (B) the Pacific Ocean (C) water evaporation (D) bullfrogs (E) peachleaf willow (F) a hydraulic system (G) mussels (H) hydrogen
A:
A