Concept:Vygotsky believed language is a social tool that drives cognitive development.Explanation:According to Vygotsky, language enables children to interact socially and learn from others.It helps them share experiences, gain knowledge, and solve problems that they cannot solve alone.Language also helps children regulate their own behavior and control their environment.Thus, language plays a crucial role in shaping a child's thinking and learning.Answer:Option A: Plays a significant role in cognitive development of children.