You Just Adopted a Puppy and Want to Teach It

You just adopted a puppy and want to teach it to fetch the newspaper.What approach would B.F.Skinner advise you to take?

A) Punish the puppy each time it does not fetch the paper.
B) Give the puppy a treat each time it gets a little closer to fetching perfectly.
C) Give the puppy a treat each time it fetches perfectly and not otherwise.
D) Be patient and understand that behaviour shaping occurs naturally over developmental stages.