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.