A Dog Wags Its Tail Whenever It Sees Its Master

Multiple Choice

A dog wags its tail whenever it sees its master. If this is a learned response, what would the dog have to do in order to demonstrate stimulus generalization?

A) continue wagging its tail for some time after its master has left
B) wag its tail more vigorously than usual if it has not seen its master for a long time
C) bark or growl when it sees someone other than its master
D) wag its tail when it sees someone who looks similar to its master