A)understanding object permanence.
B)the reduction in egocentrism.
C)the ability to think symbolically.
D)abstract and scientific thinking.
C) the ability to think symbolically. In the preoperational stage (preschool), the child begins to think communicate with symbols. This is key in the preop stage but lacking until the very end of the sensorimotor stage.
A) understanding object permanence. This happens in the sensorimotor stage. Both stages involved have this ability.
B) the reduction in egocentrism. This is resolved in Concrete stage. It does lessen in the preop stage; however, symbolism is a hallmark of the first substage in the preop stage (The Symbolic Function Substage).
D) abstract and scientific thinking. This happens when preteen.

A
References :
C) the ability to think symbolically. In the preoperational stage (preschool), the child begins to think communicate with symbols. This is key in the preop stage but lacking until the very end of the sensorimotor stage.
A) understanding object permanence. This happens in the sensorimotor stage. Both stages involved have this ability.
B) the reduction in egocentrism. This is resolved in Concrete stage. It does lessen in the preop stage; however, symbolism is a hallmark of the first substage in the preop stage (The Symbolic Function Substage).
D) abstract and scientific thinking. This happens when preteen.
References :