The correct answer is C. Yamunanagar.
The Hathni Kund Barrage is a barrage on the Yamuna River located in Yamunanagar district of Haryana, India. It was constructed in 1974 to provide irrigation and drinking water to the states of Haryana, Punjab, and Rajasthan. The barrage is also used for power generation and flood control.
The other options are incorrect because they are not districts of Haryana. Sonipat is a district in the Indian state of Haryana. Panipat is a district in the Indian state of Haryana. Fatehabad is a district in the Indian state of Haryana.