What is private speech and its role in child cognitive development (Vygotsky)?

What is private speech and its role in child cognitive development (Vygotsky)?

• A. Internal thoughts only; irrelevant to problem solving
• B. Public speech used with peers
• C. Private speech is self-talk used to guide thought and behavior; supports self-regulation and problem-solving, gradually internalizing as inner speech
• D. Random mumbling with no cognitive function

Answer: (C)