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: Mammals generate heat mainly by keeping their metabolic rate high., Fact2: Excess body weight raises metabolic heat production., Question: What raises metabolism? (A) cigarettes (B) Chlorophyll (C) Chemical energy (D) aerobic capacity (E) fossil fuels (F) Fully cooking the oysters (G) smoking cigarettes (H) excess body weight
H