Concept:Effective teaching in primary classes uses both examples and non-examples to make learning clear and meaningful.Explanation:Examples show similar situations to help students understand a new concept easily.Non-examples show contrasting situations to stretch students’ thinking and deepen their understanding.Using only examples can limit learning, while using only non-examples can confuse beginners.Therefore, a teacher should give both examples and non-examples for a complete and engaging learning experience.Answer:Option B: Give both examples and non-examples