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