Concept:Language is a rule-governed, symbolic system used for human communication, composed of multiple interrelated subsystems. Explanation:Language is not just a scientific system or only written form. It includes sounds, words, patterns, and grammar working together. Linguists describe language as a "system of systems" because it has subsystems like phonology, morphology, syntax, and semantics. These subsystems interact to create meaning. Option C correctly states this fundamental property. Options A, B, and D are incomplete or incorrect. Answer:C. Language is a system of systems.