When using PowerPoint, to play a PowerPoint show for previewing the show, select

Answer: Option C

To play a PowerPoint show for previewing, you would select Option C: View, slide show. This option allows you to view the presentation in full screen mode, exactly as it will appear when presented to an audience.
Option A: View, slide sorter displays all slides in miniature form, allowing you to rearrange their order, but does not play the show.
Option B: View, slide shows individual slides in editing mode, not in full-screen presentation mode.
Option D: View outline displays the presentation in outline form, showing slide titles and main points.
Therefore, the correct answer in this context is Option C: View, slide show.