What is the primary process that occurs in an internal combustion engine to convert fuel into energy?

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A) Combustion of fuel mixed with air creates a high-pressure gas that drives the engine pistons.

B) Fuel is vaporized and cooled to create a vacuum that pulls the pistons down.

C) Electric spark ignites the fuel, causing a chemical reaction that cools the engine.

D) Fuel is compressed to a liquid state, which then expands and pushes the pistons.

Quiz: What is the primary process that occurs in an internal combu