Concept:Functional grammar studies how language is used in real-life communication to achieve specific purposes.Explanation:Functional grammar focuses on the practical use of language rather than just rules or structure. It examines how grammatical choices help convey meaning in different contexts. This approach helps learners use language effectively for interaction in daily life. It is not about memorizing rules or analyzing syntax in isolation. Instead, it prioritizes communication and the ability to express ideas clearly. For example, it looks at how sentences are used to inform, request, or persuade. Therefore, functional grammar is centered on the use of language to meet the needs of the speaker and listener.Answer:Option B - use of language.