Concept:Language is a structured and rule-governed system made of smaller subsystems like sounds, words, and grammar.
Explanation:Language is organized in layers: sounds form words, words form sentences, and sentences convey meaning.
Each layer follows its own rules, making the whole a "system of systems."
It is symbolic, shared by a community, and used for communication.
Thus, language is not just a single system but a combination of multiple interconnected systems.
Answer:A. a system of systems