Concept:Non‑examples are contrasting instances that help students clearly understand the defining features of a concept by showing what it is not.
Explanation:The teacher uses non‑examples to highlight the essential characteristics of a concept.
They are given when students have prior knowledge or experience related to the topic.
Non‑examples also help correct misconceptions and make learning more flexible.
They do not confuse students; instead, they clarify the boundary of the concept.
Thus, non‑examples are a powerful tool for making the defining features of a concept clear.
Answer:C. should be used to enhance clarity about defining features of that concept.