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: if gas is heated then that gas will expand, Fact2: Cottages are heated by gas space heat or gas furnaces., Question: gas does what after going through a furnace into a cottage (A) expands (B) becomes toxic (C) has odor (D) warmth (E) Rise (F) moves (G) burning (H) compresses
A:
A