What option allows you to quickly apply a design theme to your presentation?

The Design tab is the correct choice for quickly applying a design theme to a presentation. This tab is specifically tailored to manage the visual aesthetics of slides within PowerPoint. When you click on the Design tab, you gain access to a variety of pre-designed themes that can be applied with just one click. This allows for consistent and professional-looking presentations without manually altering each slide's design elements.

The Design tab also offers options for customizing themes and modifying the overall style of the presentation, such as selecting colors, fonts, and background styles that align with the theme you’ve chosen. The ability to preview different themes as you browse through them in the Design tab makes it even easier to find the right look for your presentation.

In contrast, the Slide Show tab primarily focuses on presentation playback options, such as starting the slide show and setting up rehearsals for timings. The Review tab is designed for collaborating and providing feedback on the content, including options for spell-checking and comments. The Transitions tab is used to specify how slides transition from one to another during the presentation but does not provide options for overall design or themes.