Janie Is a 3-Month-Old Infant Participating in an Experiment

Janie is a 3-month-old infant participating in an experiment. She's lying in her crib with one end of a ribbon tied to her foot and the other end tied to a mobile dangling over her crib. She quickly learns that she controls the movement of the mobile with her kicking. One week later, the researchers return, tie the ribbon to her foot and hang the mobile above her crib. Immediately, Janie starts vigorously kicking. What does this experiment demonstrate?

A) Three-month-olds can remember things for at least a week.
B) Three-month-olds can relearn the kicking strategy very quickly at the second test.
C) Kicking behavior is very easy to learn.
D) Mobiles are very interesting to 3-month-olds.