Final answer:
Applying the brake deactivates cruise control in a car.
Explanation:
Applying the brake will deactivate the cruise control in a car. When the brake is applied, it signals the car's system to disengage the cruise control function, allowing the driver to manually control the speed.
Releasing the accelerator pedal would not deactivate cruise control but rather allow the car to coast or slow down while still maintaining the set speed. Applying the accelerator pedal and driving down a steep hill would not deactivate the cruise control.
Learn more about Deactivating cruise control in a car here:
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