Final answer:
In an emergency stopping situation on a slippery road without ABS, one should pump the brakes to avoid wheel lock and maintain control.
Step-by-step explanation:
In an emergency stopping situation when braking on a slippery road without anti-lock brakes (ABS), the correct method to stop the vehicle is to pump the brakes.
This action helps to prevent the wheels from locking up and allows the driver to maintain some steering control. Initially, you apply pressure on the brake pedal until the wheels start to lock, then you release slightly, and repeat this pumping action until the vehicle comes to a stop.
On the other hand, applying the brakes hard and steadily without ABS can cause the wheels to lock up, leading to a loss of control, whereas a forced downshift primarily helps slow down a vehicle rather than stop it quickly in an emergency and can possibly cause additional skidding on a slippery surface.
Therefore, the correct answer is B. Pump the brakes.