According to Piaget, What Does Egocentric Speech Indicate About the Child

According to Piaget, what does egocentric speech indicate about the child?

A) It is a sign of use of language to mediate behaviour and facilitate performance of difficult tasks.
B) It is a sign of cognitive immaturity and egocentrism that characterizes preschoolers and early-grade-school children.
C) It is a sign of cognitive immaturity and should be discouraged among young children so that it does not interfere with task performance.
D) It is a sign that the child is cognitively gifted.