In an uncertain situation, you can gain a few vital metres to avoid an accident by placing your foot...

A)on top of the brake pedal, pressing it lightly.
B)in front of the clutch pedal.
C)in front of the brake pedal without pressing it.Correct
When braking or reducing speed in an uncertain situation (such as at an intersection where a vehicle appears likely to fail to yield right of way), if you place your foot in front of the brake pedal without pressing it, you will react more quickly, since you are prepared for the unexpected, and you will have more distance available to stop the vehicle.