Concept:Private speech is talking to oneself, which Vygotsky believed helps children guide their own thinking and actions.Explanation:According to Vygotsky, private speech is a tool for self-regulation. It helps students plan, organize, and control their thoughts during problem-solving. By verbalizing steps, they can better focus and correct mistakes. This process improves cognitive skills. It is not egocentric or a hindrance, but a natural part of learning.Answer:Option A: helps the students to regulate their thinking.