How do you apply a theme to a PowerPoint presentation?

To apply a theme to a PowerPoint presentation, the correct method involves navigating to the "Design" tab where you can select from a variety of pre-defined themes. These themes provide a comprehensive look that includes specific colors, fonts, effects, and background designs, creating a cohesive visual style throughout the entire presentation. Choosing a theme not only enhances the aesthetic appeal but also ensures consistency across all slides, making your presentation appear more professional and organized.

The other options relate to different aspects of slide customization. For instance, the "Transitions" tab is focused on adding visual effects between slides, which helps in controlling the flow of your presentation rather than its overall design. Accessing the "Insert" tab allows you to add specific elements like images or shapes, but not a theme for the entire presentation's look. Modifying the "Layout" adjusts the arrangement of content on a particular slide but does not alter the theme or overarching design palette of the presentation. This distinction highlights why selecting a theme from the "Design" tab is the most effective approach for a consistent visual style.