Johnny, who is only 4 years old, stands in front of you blocking your view of the television screen, and he does not realize that he is doing so. He thinks that his view is the same as yours. Johnny is displaying _________ and is in Piaget’s ____________ stage of cognitive development.

a. egocentrism; concrete

b. egocentrism; preoperational

c. centration; concrete

d. centration; preoperational