A Woodchuck Tries to Crack a Walnut Shell in Two

Multiple Choice

A woodchuck tries to crack a walnut shell in two different ways-with his paws and with his teeth.The last method worked and the first did not,hence the woodchuck will be more likely to rely on his teeth for splitting the next nut.This observation illustrates the:

A) discrimination principle.
B) law of practice.
C) law of effect.
D) Premack principle.