According to Piaget, How Could We Determine Whether a Child's

According to Piaget, how could we determine whether a child's thinking is egocentric?

A) Show the child a pile of objects and ask how it would look from the back.
B) Give the child a bag full of candies and ask him or her to share it with a group of friends.
C) Ask the child "What do you want to be when you grow up, and why?"
D) Tell the child not to play with his or her favorite toy, and then watch what the child does.