According to Vygotsky, What Is the Function of the Egocentric

According to Vygotsky, what is the function of the egocentric speech that young children use prior to engaging in true dialogue?

A) to show their conversational partners whose ideas are the best
B) to help them organize their thoughts and regulate their behavior
C) to practice how to pronounce words and give utterances the proper tone
D) to regulate others before regulating themselves