Final answer:
To prevent brakes from locking if a vehicle does not have ABS, the driver should press the brakes hard, release slightly if a wheel locks, and repeat the process.
Step-by-step explanation:
The correct answer is option C~ Press the brakes hard, release slightly if a wheel locks, repeat.
When a vehicle does not have an Anti-lock Braking System (ABS), it is important to prevent the brakes from locking. This can be done by applying and releasing the brakes in a specific manner. By pressing the brakes hard and then releasing slightly if a wheel locks, the driver can maintain control of the vehicle and prevent the brakes from fully locking up.
For example, let's say you are driving on a wet road and need to come to a sudden stop. If you apply the brakes too forcefully, the wheels may lock up and cause the vehicle to skid. However, by pressing the brakes hard and releasing slightly if a wheel locks, you allow the wheels to regain traction and maintain control of the vehicle.