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The correct answer to the question is C. engine. An engine is a device that transforms the chemical energy present in fuel into mechanical energy. This process is essential for powering vehicles, machinery, and various other mechanical systems.
Engines come in different types such as internal combustion engines found in cars, motorcycles, and small airplanes, or external combustion engines like steam engines. These engines consist of various components like pistons, cylinders, camshafts, and many more, working together to convert the energy stored in fuel into usable mechanical energy.
In the context of the question, while components like pistons, cylinders, and camshafts play crucial roles within an engine, the term "engine" encompasses the entire mechanism responsible for converting chemical energy into mechanical energy. Therefore, the most fitting answer is C. engine.
