Research That Supports the Notion That Animals, Such as Pigeons

Multiple Choice

Research that supports the notion that animals, such as pigeons, rats, and scrub jays, are sensitive to the passage of time includes

A) the behavior of pigeons and rats on fixed interval schedules.
B) pigeons that learn to peck at different keys based on the time.
C) scrub jays' choice of hoarded food based on which food would be edible or not after five days.
D) all of these.