Sherry Wants Her Dog to "Heel" on Command

Multiple Choice

Sherry wants her dog to "heel" on command.At first she gives the dog a treat for coming to her when she speaks the command,"Heel!" Then she only rewards the dog when it stands at her side when she gives the command and,finally,she rewards the dog only when it is at her side and facing front.Sherry is using ______.

A) higher-order conditioning.
B) biological readiness.
C) shaping.
D) generalization.