One of the effects that some drugs can produce in the driver is...

A)an expansion of the visual field.
B)a decrease in stopping distance.
C)incorrect perception of time and space.Correct
Most existing drugs alter the perception of time and space, which means that distances are misjudged while driving.
The stopping distance is the distance the vehicle travels from the moment we see an obstacle or hazard until the vehicle comes to a complete stop (reaction distance + braking distance).
With the consumption of alcohol and drugs, our reaction time increases and consequently the reaction distance increases, thereby increasing the stopping distance.