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The camshaft is driven by the crankshaft in an engine because they are interconnected through a timing mechanism. As the crankshaft rotates during the engine's operation, it plays a crucial role in orchestrating the timing of the opening and closing of the engine's valves via the camshaft. This synchronization is essential for effective engine performance, as it ensures that the engine operates efficiently, allowing for optimal air-fuel mixture intake and exhaust gas expulsion.

The crankshaft's movement translates into the rotational movement of either a timing belt or a timing chain (often associated with other answers), which directly controls the camshaft's operation. This system is designed to maintain precise timing between the crankshaft and camshaft to facilitate the internal combustion process.

In contrast, options related to the flywheel and oil pump do not drive the camshaft. The flywheel helps in maintaining engine momentum and smoothens power delivery, while the oil pump circulates oil for lubrication, cooling, and cleaning, but neither affects the drive mechanics of the camshaft directly.