Option c is the correct answer. Ghiyasuddin Tughluq did not contribute to the construction of the famous 'Qutb-Minar'. Delhi's Qutub Minar, an iconic five-tiered edifice, stands as a testament to the efforts of rulers spanning four centuries. Originally initiated by Qutb-ud-din Aibak in 1192 to commemorate his victory, the minaret bears his name, despite him only completing its first story. Shams-ud-din Iltutmish, his successor, expanded it with three more levels by 1220. Lightning struck the top tier in 1369, leading to Firoz Shah Tughlaq's restoration and the addition of the fifth story. Sher Shah Suri built the entrance. Important Tips Fact about Qutb-Minar: In 1803, an earthquake inflicted significant damage on the fifth tower. Major Robert Smith of the British Indian Army undertook its restoration in 1828. He elevated its stature by adding a pillared cupola above the fifth story, essentially bestowing a sixth story upon the tower. However, this additional level was dismantled in 1848 under the directives of Henry Hardinge, the then Governor-General of India. It was reinstalled adjacent to the minaret. Entry to the tower has been restricted since 1981 due to a tragic incident that claimed the lives of 47 individuals inside.