Vicki Was Sitting in the Rocking Chair and Playing with Her

Multiple Choice

Vicki was sitting in the rocking chair and playing with her doll. She dropped the doll, which landed out of view behind the rocking chair. A few moments later, Vicki climbed down and retrieved the doll. Vicki's behavior suggests that she has acquired the understanding of:

A) object permanence.
B) abstract reasoning.
C) centration.
D) conservation.