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 latter method worked and the former 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