Lev Vygotsky was a Russian psychologist, He emphasized the role of society and culture in the development of the child. According to Vygotsky, the main needs in the development of a child are-Social interactionCultureLanguage?Vygotsky provided a sociocultural perspective on cognitive development. He attempted to establish the relationship between the child's development and the sociocultural context in which the child was situated. Vygotsky viewed language as an important mediator between learning and development. Language assumes a central role in development.Vygotsky writes that language enables children:In solving difficult tasks (when children articulate a problem it happens in a language).To overcome impulsive action (children control themselves through language; if they are tempted to touch an electric switch they say œno to themselves)to plan a solution to a problem before executing it.Language is not only needed for interaction with others, it is an important aspect of the development of mental processes in the socio-cultural milieu.That's why Vygotsky states that Language is the foundation of the higher cognitive process.So Option (1) is the correct answer.HintAdaptation, Organization, and Equilibration are the terms given by Jean Piaget in the Theory of Cognitive Development.