Explanation: Delhi, the capital city of India, is situated on the banks of the Yamuna River. The Yamuna is a major tributary of the Ganga and is the second-largest river in the Indian subcontinent. The river has played a significant role in the development and strategic importance of Delhi since ancient times.
The historical significance of Delhi as a major urban center can be traced back to the 12th century. During this period, Delhi began to emerge as a political and cultural hub in northern India. The city's location on the banks of the Yamuna River provided it with several advantages, including fertile land for agriculture, a reliable water supply, and a strategic position for trade and commerce.
The Yamuna River has been a crucial factor in the city's development. It has not only provided water for irrigation and drinking but has also been a vital transportation route. The river facilitated the movement of goods and people, contributing to the economic growth of the region. Additionally, the river's banks have been used for various religious and cultural activities, further enhancing the city's importance.
The 12th century marked a significant period in Delhi's history. It was during this time that several dynasties, including the Chauhans and the Tomars, established their rule in the region. The city's strategic location and the presence of the Yamuna River made it an ideal site for these rulers to establish their capitals. The construction of several forts and monuments, such as the Qutub Minar, also began during this period, further cementing Delhi's status as a major urban center.
In conclusion, the correct answer is that Delhi, a city on the banks of the Yamuna River, became an important city in the 12th century. This period marked the beginning of Delhi's emergence as a significant political, cultural, and economic center in northern India, largely due to its strategic location and the advantages provided by the Yamuna River.