Which of the following is a strong statement of Vygotsky's ideas on private speech?

A) Children who use private speech are socially withdrawn.
B) Children who use private speech do so to govern their behavior and guide themselves.
C) Self-talk will never become second nature to children.
D) Inner speech is not a part of a child's thoughts.

Vygotsky believed that private speech plays an important role in self-regulation and self-guidance for children. Therefore, option B is a strong statement of his ideas on private speech. Option A is incorrect as Vygotsky did not associate private speech with social withdrawal. Option C is incorrect as Vygotsky believed that private speech can become internalized and function as inner speech. Option D is incorrect as inner speech is seen as an important part of cognitive development in Vygotsky's theory.