The first operating system to include a graphical user interface (GUI) is generally considered to be the Xerox Alto, which was developed in the early 1970s. However, it was not a commercial product.
Among commercial operating systems, the Apple Macintosh, which introduced in 1984, is often credited with bringing the GUI to a wider audience. MacOS has its roots in the Macintosh system, but it's important to note that it was preceded by systems like the Xerox Star that used GUIs.
In your provided options, the correct answer is MacOS, as it represents the early popularization of graphical user interfaces in personal computing.