Explanations:The Delhi Sultanate, which ruled over much of northern India from the 13th to the 16th century, was responsible for the development of several cities around the Delhi region. These cities were often built by different rulers to serve as their capitals, each with its own unique historical context and purpose.
Jahapanah, also known as Jahanpanah, was one of the cities developed by the Delhi Sultanate. It was built by Ghiyas-ud-din Tughlaq, the founder of the Tughlaq dynasty, in the early 14th century. Jahapanah was constructed as a fortified city to protect the capital from invasions and to serve as a new administrative center. The city was strategically located between the older cities of Siri and Tughlaqabad, and it played a significant role in the urban development of the Delhi region during the Tughlaq period.
Siri was another city developed by the Delhi Sultanate, specifically by Alauddin Khalji, the founder of the Khalji dynasty, in the early 14th century. Siri was built as a fortified city to protect the capital from Mongol invasions and to serve as a new administrative center. The city was strategically located on the southern side of the older city of Delhi and was known for its strong fortifications and impressive architecture.
Delhi-i-kunha, also known as Old Delhi, was developed by Firoz Shah Tughlaq, the successor of Ghiyas-ud-din Tughlaq, in the 14th century. It was built as a new capital to replace the old city of Delhi and to serve as a new administrative center. The city was strategically located on the banks of the Yamuna River and was known for its impressive architecture and urban planning.
However, Agra was not developed by the Delhi Sultanate. It was primarily developed during the Mughal period, especially under the rule of Akbar, Jahangir, and Shah Jahan. The city is famous for the Taj Mahal, which was built by Shah Jahan in the 17th century as a mausoleum for his wife Mumtaz Mahal. Agra was the capital of the Mughal Empire during the reign of Akbar and later served as a secondary capital under Shah Jahan. The city's development was primarily driven by the Mughal rulers, who transformed it into a center of art, culture, and architecture.
Therefore, the correct answer is C) Agra, as it was not developed by the Delhi Sultanate but rather by the Mughal rulers.