The correct answer is (c). A slide transition is a special effect used to introduce a slide in a slide show. It can be used to add interest and visual appeal to a presentation, and to help the audience follow the flow of the presentation. There are many different types of slide transitions available, and the best type to use will depend on the content of the slide show and the desired effect.
(a) Letter is not a slide transition. A letter is a written communication that is sent from one person to another. It is typically used to convey information or to request something.
(b) Overheads are a type of presentation aid that is used to project images onto a screen. They are typically made on transparencies that are placed on an overhead projector. Overheads can be used to show text, images, or graphs.
(d) None of these is the correct answer.