As you increase the speed of your car, the engine has to operate at higher and higher speeds in order to move the car along. if the engine was left in a low gear, the speed could become so excessive that it might damage the engine. which of these will prevent this from occurring? a. shifting the vehicle into a lower gear to increase engine speed b. shifting the vehicle into a higher gear to increase engine speed c. shifting the vehicle into a higher gear to reduce engine speed d. shifting the vehicle into a lower gear to reduce engine speed