The Tarbela Dam, a monumental engineering feat and one of the world's largest earth-filled dams, was completed in 1976. Located on the Indus River in Pakistan, its construction began in 1968 as part of the Indus Basin Project. The dam is vital for Pakistan's economy, providing extensive irrigation for agricultural lands and generating a significant portion of the country's hydroelectric power.
Option D, 1976, is the correct year for the completion of the Tarbela Dam, marking the culmination of years of intensive construction work. Options A (1972), B (1974), and C (1975) are incorrect. While these years fall within the dam's construction period, they do not represent its final completion date. The dam's full operational status and formal inauguration occurred in 1976, making it a cornerstone of Pakistan's water and energy infrastructure since then.