Suppose you want your goldfish to swim to the top of the tank only when you shine a red light, and no other color, into the water. Assuming the fish can see most colors, to condition the fish you should: A) train it only with the red light.

B) use red, orange, and purple lights, and only reward the fish for swimming to the surface when the red light is used.

C) withhold training until the testing phase.

D) use red, blue, and yellow lights, and only reward the fish for swimming to the surface when the red light is used.