Concept:Procedural knowledge is the "know-how" to perform tasks, like applying grammar rules in real communication.Explanation:Procedural knowledge means knowing how to do something, not just knowing facts.In language, it helps learners use grammar rules while speaking or writing.It goes beyond memorising rules and focuses on applying them in communication.This knowledge is goal-oriented and helps solve real-world language problems.Answer:C. apply the rules of grammar in communication