Explanations:The question pertains to the historical context of Delhi and the impact of the invasion by Nadir Shah, the ruler of Iran, in 1739. To understand the devastation described by contemporary observers, it is essential to delve into the historical background of Delhi and the urban centers that existed during the Mughal period.
Delhi, as a city, has a rich and complex history, with several urban centers developing over time. Shahjanabad, also known as the Old City of Delhi, was established by the Mughal Emperor Shah Jahan in the mid-17th century. It served as the capital of the Mughal Empire and was a significant center of political and cultural activity. The city was characterized by its grand architecture, including the Red Fort and Jama Masjid, which were symbols of Mughal power and grandeur.
In 1739, Nadir Shah, the ruler of Iran, invaded Delhi. This invasion was a significant event in the history of the Mughal Empire, as it marked a period of decline and marked the city with devastation. Contemporary accounts describe the city of Shahjanabad being turned to rubble. The invasion led to widespread destruction, looting, and the loss of valuable treasures, including the famous Peacock Throne and the Koh-i-Noor diamond.
The other options provided in the question do not fit the historical context of the invasion. Agra, while an important Mughal city, was not the primary target of Nadir Shah's invasion. Fatehpur Sikri, another Mughal city, had been abandoned by the time of the invasion and was not affected. Karachi, located in present-day Pakistan, was not part of the Mughal Empire and was not involved in the invasion of Delhi.
Therefore, the correct answer is Shahjanabad, as it was the city that experienced significant devastation during Nadir Shah's invasion in 1739. This event is a crucial part of Delhi's history and highlights the impact of external invasions on the urban centers of the Mughal Empire.