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: Grasses supply most of the food consumed by people worldwide., Fact2: Grasses are also important food for waterfowl., Question: important food for waterfowl supply most of the food consumed by what? (A) agriculture (B) it needs them (C) keeps the organism warm (D) people worldwide (E) our planet (F) monkeys in trees (G) tigers in the wild (H) wolves in nature
A:
D