Correct Answer:
A. Kargil War
Captain Karnal Sher Khan Shaheed was posthumously awarded Pakistan's highest military gallantry award, the Nishan-e-Haider, for his exceptional bravery during the Kargil War in 1999. He displayed immense courage and leadership in defending his post against multiple Indian attacks, ultimately sacrificing his life. Options B (1982 War) is incorrect as there was no major war involving Pakistan in 1982. Options C (1971 War) and D (1965 War) are incorrect because while these wars saw many heroes, Karnal Sher Khan's specific act of valor occurred much later during the Kargil conflict.