Operant behavior is: a. controlled primarily by its antecedents b. controlled primarily by its consequences c. elicited d. voluntary e. both b and d

E). Both b and d

Explanation:

Operant behaviour or conditioning which is also known as Instrumental conditioning is a type of learning process in which the strength of an organism or individuals behaviour is modified by punishment or reinforcement either positively or negatively.

Operant behavior is said to be "Voluntary" because the responses of the organism are under its control.