In a Skinner Box,rats often pause after getting food.Which schedule of reinforcement leads to the longest pauses

A)  fixed interval schedule
B)  fixed ratio schedule 
C)  variable interval schedule
D)  variable ratio schedule

Skinner Box

Is a controlled environment used to observe and study the behavior of animals, especially in experiments involving operant conditioning.

Variable Ratio Schedule

A reinforcement schedule in operant conditioning where rewards are provided after an unpredictable number of responses, promoting high and steady rates of behavior.