The correct answer is: A. slide show, custom transition
In PowerPoint, you can set the timing for each object on a slide by going to the Slide Show tab and clicking on the Custom Animation button. This will open the Custom Animation task pane, where you can select the objects you want to animate and then specify the timing for each animation.
Option B, Slide show, Slide transition, is incorrect because the Slide transition options control the way that slides are displayed during a slide show, not the way that objects on a slide are animated.
Option C, slide show, custom animation, is incorrect because the Custom animation options control the way that objects on a slide are animated, but they do not allow you to set the timing for each animation.
Option D, view, slide sorter, is incorrect because the Slide sorter view is used to view and rearrange slides in a presentation, not to animate objects on a slide.