The correct answer is A. Sonipat.
Sonipat is a city in the Indian state of Haryana. It is the headquarters of Sonipat district. The city is located on the banks of the Yamuna River, about 30 kilometers (19 mi) north of Delhi. Sonipat is a major industrial and commercial center. It is also a major transportation hub, with a railway station and an airport.
The city has a population of over 300,000 people. The majority of the population is Hindu, with a small Muslim minority. The city is also home to a number of Sikh and Jain temples.
Sonipat is a very old city. It is mentioned in the Mahabharata and the Ramayana. The city was also ruled by the Mughals and the British.
Sonipat is a very important city in Haryana. It is a major industrial and commercial center. It is also a major transportation hub. The city is home to a number of historical and religious sites.
The other options are incorrect because they are larger cities than Sonipat. Faridabad is the largest city in Haryana, with a population of over 1.5 million people. Karnal is the second largest city in Haryana, with a population of over 900,000 people. Rohtak is the third largest city in Haryana, with a population of over 500,000 people.