A psychologist conducts an experiment by feeding pigeons blue and red seeds that are otherwise identical. The blue seeds contain a chemical that makes the birds sick. The psychologist wants to know how long it will take the birds to learn that only the red seeds are good to eat. Which psychologist would most likely conduct this experiment?

A. John B. Watson (behaviorist)
B. Abraham Maslow (humanist)
C. Wilhelm Wundt (structuralist)
D. Sigmund Freud (psychoanalyst)
E. Wolfgang Köhler (Gestaltist)