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: when the seasons change from the summer to the fall , the amount of daylight will decrease, Fact2: Daylight is shorter, and the light from the Sun is cooler., Question: When the seasons change from the summer to the fall, what decreases? (A) sunlight (B) rainfall (C) salinity (D) Sun light (E) rain (F) energy usage (G) ice (H) distance
D