In MS PowerPoint, an effect applied to a single object on one slide, such as making a picture fly in, is called a/an:

The correct answer is C, Animation. Animations act on the objects of a slide — text, shapes, pictures, charts, SmartArt — and fall into four groups: Entrance, Emphasis, Exit and Motion Paths. Their order and timing are managed in the Animation Pane, and the Animation Painter copies an effect from one object to another. Option A, Transition, is the effect between two slides, not within one. Option B, Theme, is the ready-made set of colours, fonts and background effects that gives the deck a uniform look. Option D, Layout, is the arrangement of placeholders on a slide, such as Title Slide or Title and Content. Only the animation moves a single object, which is why C is right. A memory hook helps here. A transition needs two slides to exist at all, while an animation needs only one object, so any question that names a single picture, a single chart or one line of text is asking about animation.