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Q: Which of the following was the first operating system written in 'C' language?
  • A. UNIX
  • B. Windows 95
  • C. Xenix
  • D. LINUX
Correct Answer: Option A - UNIX is an operating system that originated at Bell Labs in 1989. It became the first operating system written in the C language.
A. UNIX is an operating system that originated at Bell Labs in 1989. It became the first operating system written in the C language.

Explanations:

UNIX is an operating system that originated at Bell Labs in 1989. It became the first operating system written in the C language.