Teaching aids are used to make learning more engaging and understandable.
- Why A fits: A relevant visual, model, or demonstration can attract interest and help students connect a concept with an example.
- Why the others are incomplete: Teaching within students’ level, maintaining attention, and encouraging attentiveness are related goals, but they do not describe the broad purpose as directly.
- Practical point: An aid should support an objective and be discussed with learners; showing it without explanation or participation may add little value.

