Let's think step by step! Carbon monoxide, a product of furnaces and engines, is a:\nOptions:\n- (A) acid\n- (B) CO2\n- (C) kill\n- (D) harm\n- (E) gas\n- (F) form\n- (G) CO 2\n- (H) HPV
The thinking starts now:
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Carbon monoxide is a gas produced by furnaces and other devices that burn fuel. Fuel is burned inside the engine. Carbon monoxide is a gas produced by furnaces and other engines. The final answer: (E).
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