The correct answer is: A. Kaithal
Kaithal is a district in the Indian state of Haryana. It is located in the north-western part of the state, and is bordered by the districts of Kurukshetra, Karnal, Panipat, Jind, and Hisar. The district has a population of over 1.5 million people, and its headquarters is the town of Kaithal.
Kaithal is a major agricultural district, and is known for its cultivation of lilies. The district is home to several large lilies farms, and its lilies are exported to various countries around the world.
The other options are incorrect because they are not districts in Haryana.