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: Soil erosion harms farm and grazing lands and increases flooding and desertification., Question: When a river floods, that river harms what? (A) most organisms (B) Basic units of the plant body. (C) streams and volcanoes (D) mountains and lakes (E) farm and grazing lands (F) oceans and ponds (G) swamp vegetation (H) Plant growth is reduced
A:
E