Barbiturates are a A Stimulant B Depressant C Narcotic?

The correct answer is B: Depressant.

Barbiturates are a type of central nervous system depressant, meaning they slow down the activity of the brain and spinal cord. They were commonly used in the past as sedatives and hypnotics (sleep aids), but due to their high risk of addiction and overdose, they have been largely replaced by other medications.