The correct answer is A: Razia Sultana. Razia Sultana was the first and only female Muslim ruler of the Delhi Sultanate. She reigned from 1236 to 1240 AD, succeeding her father Iltutmish. She defied gender norms of her time by openly leading armies and administering justice, demonstrating remarkable statesmanship and military prowess. Her rule, though short, is a significant milestone in the history of the Indian subcontinent as she was a sovereign monarch.
B: Chand Bibi is incorrect. Chand Bibi was a powerful regent and warrior who defended the Ahmadnagar Sultanate against the Mughal Empire in the late 16th century. While she was an influential figure and a great military strategist, she primarily acted as a regent for her young nephew and later for the ruler of Bijapur, rather than being a sovereign queen in her own right like Razia Sultana.
C: Nur Jahan is incorrect. Nur Jahan was a highly influential empress consort during the reign of the Mughal Emperor Jahangir in the early 17th century. She wielded immense power behind the throne, issued farmans (royal decrees), and even had coins struck in her name. However, she was never the reigning monarch herself; her power was derived from her husband, the Emperor.
D: Mumtaz Mahal is incorrect. Mumtaz Mahal was the beloved wife of the Mughal Emperor Shah Jahan, for whom the magnificent Taj Mahal was built as a mausoleum. While she was a significant figure in Shah Jahan's life and an empress consort, she did not hold any political or administrative power as a ruler. Her fame is primarily associated with her personal relationship with the emperor and the iconic monument built in her memory.
Therefore, Razia Sultana stands out as the pioneering female sovereign ruler in the Indian Subcontinent.