In One Experiment with 4-Month-Old Infants, Babies Saw a Toy

In one experiment with 4-month-old infants, babies saw a toy placed behind a screen and then the screen tipped backwards. Some infants saw the screen stop when it hit the toy (as they would expect) , but other saw the screen tip all the way backwards as though the screen was going right through the toy. These infants

A) appeared distressed by the event and cried because the toy wasn't there.
B) turned away from the event and refused to look at the screen again.
C) looked considerably longer at the event than infants who saw the screen tip backwards but the toy stopped the fall of the screen.
D) tried to get out of their seats so they could explore the screen and the toy.