Explanations:The evolution of Delhi as a significant urban center in India began in the late 12th and 13th centuries. This period is crucial for understanding the historical development of the city, as it marks the establishment of the Delhi Sultanate and the construction of several important monuments and administrative centers.
The late 12th century is significant because it saw the rise of the Chauhan dynasty, which ruled over the region of Delhi. The Chauhan king, Prithviraj Chauhan, established the city of Lal Kot, which is considered the first major urban settlement in the area that would later become Delhi. Lal Kot was an important center of power and administration, and it laid the foundation for the city's future growth.
The 13th century is equally important in the evolution of Delhi. This period saw the establishment of the Delhi Sultanate, which was a Muslim kingdom that ruled over much of northern India. The first sultan of the Delhi Sultanate, Qutb-ud-din Aibak, began the construction of the Qutb Minar, which is one of the most iconic monuments in Delhi. The Delhi Sultanate also saw the construction of several other important monuments, such as the Quwwat-ul-Islam Mosque and the Alai Darwaza, which are significant landmarks in the city's history.
Therefore, the evolution of Delhi as a major urban center began in the late 12th and 13th centuries, and both these periods are crucial for understanding the city's historical development. The correct answer is option D, which includes both the late 12th and 13th centuries.