Images, symbols, and diagrams are types of art objects
Graphs
graphics
presentation objects

The answer to this question is given below in the explanation section.

Explanation:

The correct answer to this question is :

Graphics

Because Graphics are the visual representation of information without text. Images, symbols, and diagrams are types of graphics. These graphics can be used in presentations to present information visually.

While other options are not correct because:

Art objects are some images or painting that is the artistic creation of aesthetic value. While graphs are the visual presentation of data and there are different presentation objects in PowerPoint such as images, symbols, text, and diagrams, etc. But it is noted that images, symbols, and diagram are not types of presentation objects but it is a type of graphics elements/objects.