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: absorbing energy causes objects to heat, Fact2: Energy enters an ecosystem as sunlight., Question: What causes an object to heat? (A) absorption (B) photosynthesis (C) electricity (D) rays or beams (E) colors of the spectrum (F) absorbing sunlight (G) absorbing ions (H) It gets heated up
F