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: Sandbars are preferred nesting habitat., Question: Water moving sediment downstream creates what? (A) the Great Barrier Reef (B) boats (C) ice (D) nesting habitats (E) patch reefs (F) swamp vegetation (G) oceans (H) loose soil
D