Which component supplies high-voltage current to the spark plugs in an engine?

The ignition system is responsible for supplying high-voltage current to the spark plugs in an engine. This system includes components such as the ignition coil, which transforms the battery's low voltage into the high voltage needed to create a spark at the spark plugs. When the ignition system is activated, it sends this high-voltage current to the spark plugs at the correct timing, igniting the air-fuel mixture in the engine's cylinders and allowing the engine to run.

The other choices do not fulfill the role of supplying voltage to the spark plugs. The fuel pump focuses on delivering fuel to the engine, the alternator generates electrical power to recharge the battery and power electrical systems while the engine is running, and the starter is responsible for initiating engine operation by turning the engine over to start the combustion process. Each component plays a crucial role in the overall function of the vehicle, but only the ignition system is tasked with the critical function of igniting the air-fuel mixture through the spark plugs.