John Gives His Dog, Alfie (A Yap Hound), a Bit

Multiple Choice

John gives his dog, Alfie (a yap hound) , a bit of food whenever it goes 30 seconds without barking. Gradually, John increases the amount of quiet time required to earn food until finally the dog will go for
Hours without a yap.The procedure John used is best described as .

A) extinction
B) differential reinforcement of alternative behavior
C) differential reinforcement of zero responding
D) non contingent reinforcement