Correct option is B
According to Jean Piaget, private speech among children is indicative of their inability to regulate their thoughts effectively. He saw private speech as egocentric speech, where children are still learning how to interact with their environment and others. Piaget believed that this speech was a reflection of children's immature thinking processes, as they are not yet capable of considering others' perspectives or engaging in socially effective communication. Private speech diminishes as children develop better cognitive and social skills.