Given the task definition and input, reply with output. 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 greenhouse is used to protect plants from the cold, Fact2: Flowers are beautiful kinds of plants., Question: A greenhouse is used to protect flowers from what? (A) sunlight (B) fertilizer (C) salinity (D) Dehydration (E) cold air (F) the cold (G) Winter (H) irrigation
F