The correct answer is: B. Format -> Slide Design
The Format menu is located in the menu bar at the top of the PowerPoint window. The Slide Design command is located in the Format menu. This command allows you to apply a design template to your presentation. A design template is a pre-made set of colors, fonts, and layouts that you can use to give your presentation a professional look.
The other options are incorrect because they do not correspond to the correct menu command. The Tools menu is used to access commands for managing your presentation, such as checking spelling and grammar. The Insert menu is used to add new slides, objects, and other elements to your presentation. The Slide Design command is not located on either of these menus.