Concept:Surplus Energy Theory is related to play, not to language development. The other three theories explain how children learn language.Explanation:Languages development theories include: Conditioning Theory (Skinner – rewards for using language), Theory of Imitation (children copy what they hear), and Theory of Maturation (Gesell – development follows an innate sequence).Surplus Energy Theory describes play as a way to release extra energy. It does not explain how language is acquired.Therefore, among the given options, Surplus Energy Theory is not a language development theory.Answer:C. Surplus Energy Theory