When braking in a vehicle without ABS, what should you do if the brakes lock up?

Answer: A — Keep pressing the brake until the vehicle stops

When braking in a vehicle without ABS (anti-lock braking system), if the brakes lock up, you should keep pressing the brake until the vehicle stops. This is the correct approach because releasing the brake when the brakes lock up can cause the wheels to regain traction and the vehicle to regain control. By releasing the brake and then pressing it again, you are essentially allowing the wheels to keep rotating and prevent skidding. Therefore, the best course of action is to maintain steady pressure on the brake pedal until the vehicle comes to a stop.