The correct answer is C. Hisar.
Hisar is a district in the Indian state of Haryana. It is located in the northern part of the state, and is bordered by the districts of Jind to the north, Bhiwani to the east, Sirsa to the south, and Fatehabad to the west. The district has a population of over 1.6 million people, and its headquarters is the city of Hisar.
Hisar is a major producer of iron pipes. The district has a number of iron and steel mills, which produce a variety of pipes, including water pipes, gas pipes, and oil pipes. The iron pipes produced in Hisar are used in a variety of industries, including construction, manufacturing, and agriculture.
The other options are incorrect. Gurugram is a district in the Indian state of Haryana. It is located in the southern part of the state, and is bordered by the districts of Faridabad to the north, Rewari to the east, Mahendragarh to the south, and Palwal to the west. The district has a population of over 3 million people, and its headquarters is the city of Gurugram.
Yamunanagar is a district in the Indian state of Haryana. It is located in the northern part of the state, and is bordered by the districts of Kurukshetra to the north, Karnal to the east, Kaithal to the south, and Ambala to the west. The district has a population of over 1.3 million people, and its headquarters is the city of Yamunanagar.
Hisar is a major producer of iron pipes, while Gurugram, Yamunanagar, and Jind are not.