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: a sandbar is formed by water moving sediment downstream, Fact2: Bare sandbars are the ideal spots for new stands of cottonwood., Question: What is required for the ideal habitat for new stands of cottonwood? (A) sunlight (B) nutrients (C) warmth (D) Sediment (E) Black tar (F) Hot magma (G) trees (H) Chainsaws
A:
D