The correct answer is: C. Changes the look of the slide without changing the content.
A design template is a pre-made set of formatting options that can be applied to a slide or an entire presentation. This includes the slide layout, the font, the color scheme, and the background. Applying a design template can change the look of your presentation quickly and easily, without having to manually change each individual slide.
Option A is incorrect because applying a design template does not change the content of the slide. The text, images, and other objects on the slide will remain the same.
Option B is incorrect because applying a design template does not add functionality to the slide. The slide will still function the same way it did before the template was applied.
Option D is incorrect because applying a design template does change the look of the slide. The slide will have a different appearance after the template is applied.