The question asks us to identify which option is not an example of system software. Let us analyze each option:
- (A) Operating System:
An operating system (e.g., Windows, macOS, Linux) is a core component of system software. It manages hardware resources and provides a platform for running application software. Hence, this is system software.
- (B) Device Drivers:
Device drivers are programs that allow the operating system to communicate with hardware devices (e.g., printers, graphics cards). These are essential components of system software. Hence, this is system software.
- (C) Microsoft PowerPoint:
Microsoft PowerPoint is a presentation software used to create slideshows and presentations. It is a type of application software, not system software. Hence, this is not system software.
- (D) Utility Software:
Utility software includes tools like disk cleanup, antivirus software, and file managers. These are part of system software as they help manage and optimize the computer system. Hence, this is system software.
From the analysis above, the correct answer is:
\[
\boxed{\text{(C) Microsoft PowerPoint}}
\]