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When a driver presses the accelerator, the throttle ____.

A opens, which allows more air into the engine
Explaination
The throttle is mechanically or electronically connected to the accelerator. The more the driver pushes the pedal, the greater the throttle opens, allowing more air to pass through to the engine.
B breaks down to signal that maximum speed has been reached
C remains neutral, as it has no connection to the accelerator
D tightens to maintain fuel efficiency