Concept:Language Acquisition Device (LAD) is a hypothetical innate mechanism for language learning, proposed by Noam Chomsky.Explanation:Chomsky argued that children are born with a biological ability to acquire language. This inborn capacity is called the Language Acquisition Device. It helps children analyze language, extract rules, and produce grammar naturally. Other theorists like Skinner, Vygotsky, and Piaget had different views on language development. Skinner focused on imitation and reinforcement. Vygotsky emphasized social interaction. Piaget highlighted cognitive understanding before language. Only Chomsky used the term LAD.Answer:C. Chomsky