A. AT & Ts Bell Laboratories of USA in 1972
B. AT & Ts Bell Laboratories of USA in 1970
C. Sun Microsystems in 1973
D. Cambridge University in 1972

Solution

A. AT & Ts Bell Laboratories of USA in 1972

Explanation

C programming language was developed in 1972 by Dennis Ritchie at bell laboratories of AT&T (American Telephone & Telegraph), located in the U.S.A. Dennis Ritchie is known as the founder of the c language. It was developed to overcome the problems of previous languages such as B, BCPL, etc.