Who co-created the UNIX operating system in 1969 with Dennis Ritchie?

The correct answer is C. Ken Thompson.

Ken Thompson and Dennis Ritchie are the co-creators of the UNIX operating system. They developed it at AT&T’s Bell Labs research center in the late 1960s and early 1970s. UNIX was originally designed for use on minicomputers, but it has since been ported to a wide variety of platforms, including mainframes, supercomputers, and personal computers.

Bjarne Stroustrup is the creator of the C++ programming language. Steve Wozniak and Steve Jobs are the co-founders of Apple Computer. Niklaus Wirth is the creator of the Pascal programming language.