The correct answer is (d), accumulation.
Narration, description, and explanation are all devices of teaching. Narration is the act of telling a story, and it can be used to teach students about historical events, scientific concepts, or even just to entertain them. Description is the act of providing details about something, and it can be used to help students visualize a scene or understand a concept. Explanation is the act of providing information in a clear and concise way, and it can be used to help students understand complex concepts.
Accumulation is not a device of teaching. It is the act of collecting or gathering things, and it is not typically used in a classroom setting.