A scalloped response pattern, in which responses are slow at the beginning of a time period andthen faster just before reinforcement happens, is typical of which type of reinforcement schedule?

A scalloped response pattern, in which responses are slow at the begin

1.	A scalloped response pattern, in which responses are slow at the beginning of a time period andthen faster just before reinforcement happens, is typical of which type of reinforcement schedule?
A.	fixed ratio
B.	variable ratio
C.	fixed interval
D.	variable interval
Answer» D. variable interval