I want to teach a dolphin to swim through a hoop. First, I reward the dolphin for swimming near the hoop. Next, I reward the dolphin for touching the hoop. Then, I reward the dolphin for sticking his nose through the middle of the hoop. Finally, I reward the dolphin for swimming through the hoop. Psychologists call this process __________.
a) stimulus generalization
b) modeling
c) imprinting
d) shaping