Under the effects of alcohol, the reaction time...
A)is not affected.
B)decreases.
C)increases.Correct
# Explanation
Alcohol negatively affects the central nervous system, slowing down cognitive and motor processes. This causes reaction time to **increase**, that is, it takes longer to respond to emergency situations on the road. A driver under the effects of alcohol needs more time to brake or make decisions, which significantly increases the risk of accidents.