What do we call chemical substances that modify mental,emotional,or behavioural functioning

A)  stimulants
B)  psychoactive drugs 
C)  narcotics or opiates
D)  hallucinogens

Psychoactive Drugs

Substances that affect the mind, emotions, and behaviors by altering the brain's chemical messages.

Behavioural Functioning

Refers to how behaviors serve as a mechanism to cope with environmental demands and internal states.

Chemical Substances

Compounds or elements that consist of a specific set of molecules or ions; can be natural or synthetic and have various uses and effects.