Concept:A good EVS class is student-centered. It gives students the chance to ask questions and clear their doubts actively.Explanation:In an EVS class, students should not just listen or copy notes. They must get opportunities to ask questions. Asking questions keeps students engaged. It also helps teachers check what students understand. This makes learning interactive. Teachers usually give descriptions and state concepts. Definitions are also taught by the teacher. So, the main opportunity for students is to ask questions. This builds curiosity and deeper understanding.Answer:C. ask questions