The part of a vehicle is used to increase its speed is:
D. <u><em>La palanca de cambio y el acelerador</em></u>.
Explanation:
The translation of the answer is:
D. <u>Shift lever and throttle</u>.
As you possibly know, the speed of a car is driven by its mechanical structure, of which the shift lever and the accelerator are part, <u>the lever allows you to change the gear of a car</u> and even make it go in reverse, which in higher changes It makes the car go faster, while the <u>throttle regulates the air-fuel mixture that reaches the engine, causing the more mixture to reach the engine, greater force</u> and, therefore, speed reaches the car.