Concept:A slide transition is the visual effect shown when one slide changes into another during a presentation.
Explanation:In presentation software, transitions are normally triggered by a simple action from the presenter.
The most common way to activate a slide transition is by pressing the mouse button once.
This single action, called a mouse click, moves the presentation forward to the next slide.
It also starts the transition effect that animates the change between slides.
A right-click usually opens a shortcut menu instead of advancing the slide.
A mouse drag is used for selecting or moving objects, not for changing slides.
A double-click may open a file or edit an object, but it is not the standard trigger for transitions.
Therefore, during a slide show, the transition is activated by a normal mouse click.
Answer:C. mouse click