Concept:Visual aids are teaching materials that rely on sight for learning. Auditory aids use sound instead.
Explanation:Chalk, blackboard, and duster help write or draw visual content. Flashcards, charts, and soft boards display pictures or text to see and read. A projector shows images or slides, but it still projects visual information. Radio, audio tapes, and CDs deliver only sound. They are auditory aids, not visual aids. Therefore, the option that includes radio and audio tapes is the one that is not a visual aid.
Answer:C. Projector, radio, and audio tapes and CDs