In One Trick, a Magician Shows the Audience a Single

In one trick, a magician shows the audience a single apple on a table. She then puts a screen in front of the apple, picks up another apple, and apparently places it next to the first one, pulling her now-empty hand from behind the screen. She then removes the screen to reveal only a single apple. Research suggests that __________.

A) only children who passed conservation of number tasks would be surprised by the apparent disappearance of the second apple
B) 5-month-olds would look longer at the single apple than if the removal of the screen had revealed the expected two apples
C) only children who passed A-not-B tasks would be surprised by the apparent disappearance of the second apple
D) 5-month-olds would show surprise at whatever was revealed because their lack of object permanence would lead them to expect nothing behind the screen

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