Concept:A good teaching aid is most effective when it actively engages multiple senses of the learner, leading to better understanding and retention.
Explanation:Teaching aids are tools used to make lessons clear and memorable.
The most essential feature is that the aid should involve the participation of maximum senses (sight, hearing, touch, etc.).
This creates direct, multi-sensory experiences that improve learning outcomes.
While low cost, popularity, and ease of handling are useful, they are not as critical as sensory engagement.
When students use multiple senses, they learn more deeply and remember longer.
For example, a model or demonstration that students can see, hear, and handle is far more effective than just reading or listening.
Therefore, the core purpose of a teaching aid is to optimize learning by activating as many senses as possible.
Answer:C. Involving participation of maximum senses