When Veronica First Quit Smoking,she Experienced Cravings for Cigarettes Whenever

Multiple Choice

When Veronica first quit smoking,she experienced cravings for cigarettes whenever she took a coffee break.Gradually,those cravings went away,and she doesn't typically think of smoking when she has a coffee now.Sometimes,however,she still experiences a craving for cigarettes during a coffee break.What do we call the occasional craving that Veronica experiences now

A)  spontaneous recovery
B)  extinction 
C)  stimulus discrimination
D)  higher-order conditioning