The correct answer is: A. Ghata drain.
The Ghata drain is a major drain in Haryana, India. It originates from the Alwar district of Rajasthan and flows through the districts of Mahendragarh, Rewari, and Gurgaon. The drain joins the Yamuna River near the town of Hathin.
The Landoha drain is a minor drain in Haryana. It originates from the district of Jhajjar and flows through the district of Rohtak. The drain joins the Ghata drain near the town of Bahadurgarh.
The Buriya drain is a minor drain in Haryana. It originates from the district of Sonipat and flows through the district of Panipat. The drain joins the Ghata drain near the town of Panipat.
The Mahendibadi drain is a minor drain in Haryana. It originates from the district of Karnal and flows through the district of Kurukshetra. The drain joins the Ghata drain near the town of Kurukshetra.
The Ghata drain is the largest of the four drains mentioned above. It is also the most important drain in Haryana, as it provides drainage for a large area of the state.