You Can Train a Pigeon to Peck a Key for Food

Multiple Choice

You can train a pigeon to peck a key for food, but you cannot train it to bar press. Why?

A) It is difficult to reinforce an eating response in pigeons.
B) Biological preparedness
C) Pigeons cannot see very well.
D) Pigeons habituate to bars.
E) Pigeons cannot grasp a bar with their feet.