Final answer:
A GUI is special because it employs visual elements, allowing user interaction through visual components like icons and menus, making computer systems more user-friendly.
Step-by-step explanation:
A GUI (Graphical User Interface) is special because C. It employs visual elements. Unlike text-based interfaces that only use text commands, a GUI makes computer systems more accessible and user-friendly by allowing individuals to interact with the system through visual elements like icons, buttons, and menus. This eliminates the need for memorizing and typing complicated commands, as users can simply use a mouse, touchpad, or touchscreen to navigate and perform actions.