The correct answer is Faridabad.
Faridabad is a city in the northern Indian state of Haryana. It is located in the National Capital Region (NCR) and is one of the most populous cities in Haryana. Faridabad is an important industrial hub and is home to a number of manufacturing and engineering companies. The city is also a major center for trade and commerce.
Karnal is a city in the northern Indian state of Haryana. It is located in the Kurukshetra district and is one of the oldest cities in India. Karnal is an important agricultural and educational center. The city is also home to a number of historical and religious sites.
Rohtak is a city in the northern Indian state of Haryana. It is located in the Rohtak district and is one of the largest cities in Haryana. Rohtak is an important industrial and educational center. The city is also home to a number of historical and religious sites.
Hisar is a city in the northern Indian state of Haryana. It is located in the Hisar district and is one of the oldest cities in India. Hisar is an important agricultural and educational center. The city is also home to a number of historical and religious sites.
In conclusion, Faridabad is the most important industrial hub in Haryana. It is home to a number of manufacturing and engineering companies. The city is also a major center for trade and commerce.