The correct answer is (a) Muizzuddin Muhammad Gori.
Muizzuddin Muhammad Gori, also known as Muhammad Ghori, was a Turkic-Afghan ruler who established the Ghurid dynasty in the 12th century. He was the first Muslim ruler to conquer the Indian subcontinent, and he established Delhi as the capital of his empire.
Qutubuddin Aibak was a slave of Muizzuddin Muhammad Gori, and he was appointed as the governor of Delhi after the death of his master. He later declared himself the sultan of Delhi, and he founded the Mamluk dynasty.
Iltutmish was the son of Qutubuddin Aibak, and he succeeded his father as the sultan of Delhi. He was a powerful ruler who expanded the territory of the Mamluk dynasty.
Aram Shah was the son of Iltutmish, and he succeeded his father as the sultan of Delhi. He was a weak ruler who was unable to control the empire, and he was eventually overthrown by his cousin, Balban.
Muizzuddin Muhammad Gori was the first Muslim ruler to conquer the Indian subcontinent, and he established Delhi as the capital of his empire. He was a powerful and successful ruler, and he laid the foundation for the future of the Delhi Sultanate.