Concept:Open-ended questions in mathematics have no single correct answer and require reasoning, explanation, or multiple approaches, not just computation.Explanation:Such questions encourage students to explore different methods, discuss their thinking, and justify their solutions. This builds problem-solving skills and promotes mathematical communication. Contrary to option A, open-ended questions do not create confusion if structured well; they clarify thinking. Option B is incorrect because while assessment may be more thoughtful, it is not an undue burden. Option C is wrong because open-ended questions are useful throughout the learning process, not only after syllabus completion. Therefore, the primary benefit is that they provide scope for mathematical communication, allowing students to express and defend their reasoning.Answer:D. Provide scope for mathematical communication