Marla Hides Ramy's Favorite Toy Under a Blanket While Ramy

Multiple Choice

Marla hides Ramy's favorite toy under a blanket while Ramy watches.Ramy removes the blanket and squeals when he sees the toy.Marla again hides the toy,but this time under a different blanket.Even though Ramy saw where Marla hid his toy,he still looks under the first blanket and not the second one.Ramy has displayed:

A) lack of centration.
B) lack of object permanence.
C) habituation.
D) the A-not-B error.