Question

what are the products from a combustion reaction always
water only
carbon dioxide only
oxygen only
carbon dioxide and water only

Explanation:

Complete combustion of hydrocarbon fuels, the most common type of combustion reaction, always produces carbon dioxide and water. Incomplete combustion can produce additional byproducts like carbon monoxide, but the consistent, primary products across standard combustion reactions are carbon dioxide and water. The other options are incorrect as they only list one product or a reactant (oxygen is a reactant, not a product).

Answer:

Carbon dioxide and water only