Final answer:
The correct option is a.Douglas Engelbart's 'The Mother of All Demos' in 1968 showcased the graphical user interface among other technologies, becoming a pivotal moment in the evolution of computing. The demo introduced elements like the mouse and windows, which were later popularized by Apple's Macintosh computer in 1984.
Step-by-step explanation:
Douglas Engelbart is widely recognized for his groundbreaking "The Mother of All Demos", which he presented in 1968. During this demonstration, he introduced several revolutionary concepts that would shape the future of computing. Among the technologies showcased, Option a) Graphical user interfaces (GUIs) was a standout feature. Engelbart's demonstration included the use of a mouse, windows, hyperlinks, video conferencing, real-time editing, and more. These elements are foundational to the modern GUIs that are prevalent in computing devices today, from desktops to smartphones. The work of Engelbart and the evolution of the Apple II computer around 1980 served to popularize the user-friendly graphical interface that we are familiar with.
Engelbart's demo did not showcase artificial intelligence, virtual reality, or quantum computing. Instead, his pioneering work was centered around interactive computing, collaboration tools, and the GUI that became the norm after being popularized by the introduction of the Apple Macintosh computer in 1984. This was inline with the trend of increasing capability and accessibility of personal computers as predicted by Moore's Law.