Match the Definition with the Term

Match the definition with the term.
-variable-interval reinforcement schedule

A) an operant conditioning schedule in which only the first response after the pas-sage of some specified period of time is reinforced
B) an operant conditioning schedule in which reinforcement occurs after randomly varying numbers of responses have been made
C) an operant conditioning schedule in which responses are reinforced only after a preset number of responses have been made
D) an operant conditioning schedule in which responses are reinforced after random-ly varying intervals of time