Which of the following explains marijuana's apparent effect on reaction time
a.Marijuana is a hallucinogenic drug, therefore the time it takes to react is unaffected.
b.Marijuana slows physical reaction time
The following which explains marijuana's apparent effect on reaction time is definitely the second one : b.Marijuana slows physical reaction time, because it is a nice example of hallucinogen, and hallucinogenic drug usually lead to slowing reaction time.