The correct answer is: D. Text box
A text box is a container for text or graphics. It can be inserted on a slide and then formatted to change its appearance. Text boxes can be used to add titles, headings, body text, and other elements to a slide.
A slide master is a template that contains the design elements for a presentation, such as the background, fonts, and colors. Slide masters are used to create a consistent look and feel for all of the slides in a presentation.
A table is a grid of cells that can be used to organize data. Tables can be used to display information in a clear and concise way.
A placeholder is a region on a slide that is designed to hold specific content, such as a title, heading, or body text. Placeholders are used to make it easy to add content to slides.