What system steps up the voltage from the battery to send current to the spark plugs?

The ignition system is responsible for stepping up the voltage from the battery to high levels sufficient to create a spark at the spark plugs. This process is crucial for initiating the combustion process in the engine's cylinders. The ignition system typically includes components such as the ignition coil, which transforms the low voltage from the battery (usually 12 volts) into the high voltage (often over 20,000 volts) needed to create a spark. This step-up in voltage is essential for igniting the air-fuel mixture in the engine, enabling the engine to run efficiently.

Other systems mentioned, like the charging system, mainly focus on charging the battery and powering the electrical components while the engine is running. The power distribution system is responsible for distributing electrical power throughout the vehicle to various components, and the electrical system encompasses all electrical circuits but doesn't specifically focus on igniting the fuel air mixture. Hence, the ignition system is the correct answer that directly correlates to providing the necessary voltage to the spark plugs.