The correct answer is: B. Kannauj
King Harshavardhana established his capital in Kannauj in 700 AD. Kannauj was a major city in the Indian subcontinent during the Gupta Empire and the Pala Empire. It was located on the banks of the Ganges River, in the present-day state of Uttar Pradesh.
Kannauj was a major center of trade and commerce. It was also a center of learning and culture. The city was home to many temples, monasteries, and universities.
Kannauj was conquered by the Mughal Empire in the 16th century. It declined in importance after that, but it remains an important city in India today.
The other options are incorrect because they are not cities in Kurukshetra. Pehowa is a city in Haryana, Ladwa is a city in Punjab, and Jhansa is a city in Haryana.