Which definition describes psychoactive drugs?
a. drugs that act as sedatives and slow down activity and make a person calm, sleepy, or even unconscious
b. drugs that are derived from opium as well as drugs that have similar chemicals but are man-made
c. drugs that energize behavior and are often used to help a person stay awake, lose weight, or elevate mood
d. drugs that have chemicals that influence perceptions, moods, consciousness, or behavior

psychoactive drug - a drug that can produce mood changes and distorted perceptionsconsciousness-altering drug, mind-altering drug, psychoactive substancedesigner drug - a psychoactive drug deliberately synthesized to avoid anti-drug laws; mimicsthe effects of a banned drug; law was revised in 1986 to ban designer drugsdronabinol - psychoactive substance present in marijuana; used therapeutically to controlnausea associated with cancer therapydrug - a substance that is used as a medicine or narcoticeuphoriant - a psychoactive drug that tends to produce elation and euphoriahallucinogen, hallucinogenic drug, psychedelic drug, psychodelic drug - a psychoactive drug thatinduces hallucinations or altered sensory experiencestetrahydrocannabinol, THC - psychoactive substance present in marijuana

Hope this helps.