Concept:Vygotsky’s sociocultural theory says cognitive development occurs through social interaction and collaboration with others.Explanation:Vygotsky believed learning is not an isolated individual activity. Instead, children develop thinking skills by working with more knowledgeable people like teachers, parents, or peers. This social process is called collaborative learning. He introduced the Zone of Proximal Development (ZPD), where a learner can perform tasks with guidance that they cannot do alone. Through scaffolding, help from others allows children to internalize knowledge and build higher-order thinking. This shows that cognitive growth is driven by collaboration, not by individual effort or adaptation to the environment. The other options are incorrect because “individual activity” contradicts his social focus, “unified process” is too vague, and “adaptation to the environment” fits Piaget’s theory, not Vygotsky’s. Hence, the correct view is that cognitive development is a collaborative process.Answer:A. a collaborative process