Windows 8 is a system software that supports Graphical User Interface (GUI). GUI is a type of user interface that allows users to interact with electronic devices through graphical elements such as icons, buttons, and windows. It provides a more user-friendly and visually appealing way of interacting with a computer system compared to a text-based command-line interface.

Below are the reasons why Windows 8 is the correct answer:

1. Graphical User Interface (GUI):
- Windows 8 provides a graphical user interface that allows users to interact with the operating system and the applications installed on it.
- It uses visual elements such as icons, buttons, menus, and windows to represent various functions and options.
- Users can navigate through the system, launch applications, and perform tasks by clicking on these graphical elements using a pointing device such as a mouse or touch screen.

2. Features of Windows 8:
- Windows 8 introduced a new tile-based Start screen, which replaced the traditional Start menu.
- The Start screen consists of colorful tiles that represent applications and other system functions.
- Users can customize the layout of the Start screen by rearranging and resizing the tiles according to their preferences.
- Windows 8 also introduced a range of touch-friendly gestures and features, making it suitable for touch-screen devices such as tablets.

3. User-Friendly Interface:
- The GUI provided by Windows 8 is designed to be user-friendly and intuitive.
- Users can easily navigate through different applications and settings using the mouse or touch gestures.
- The visual elements and icons used in the interface are designed to be easily recognizable and understandable.
- This makes it easier for users, especially those who are not familiar with command-line interfaces, to operate the system and perform various tasks.

In conclusion, Windows 8 is a system software that supports Graphical User Interface (GUI). Its user-friendly interface, visual elements, and touch-friendly features make it suitable for a wide range of users, including those who may not have extensive technical knowledge.