Concept:Remedial teaching is a structured, step‑by‑step approach to help students who are lagging behind in a subject.Explanation:This method is not a random activity or only for primary teachers; it is a deliberate process based on the results of a diagnostic test. The teacher first identifies each learner’s specific weaknesses, then provides targeted guidance and extra practice to overcome those difficulties. It also helps teachers adjust their own teaching methods. Because it follows a clear plan—diagnose, plan, implement, and evaluate—it is called a systematic process.Answer:D. Systematic process