Correct Answer:
C. 1976
The Tarbela Dam, a major engineering marvel and one of the world's largest earth-filled dams, was constructed and completed in 1976. Located on the Indus River in Pakistan, it plays a crucial role in irrigation, flood control, and hydroelectric power generation for the country. The other years listed, 1965, 1968, and 1982, are incorrect as they do not mark the completion year of this significant infrastructure project. Its construction began in 1968, but its operational completion was in 1976.