The correct answer is: D. Madhubani, Darbhanga, Banka
The Sakri Canal is a canal in India that irrigates the lands of Madhubani, Darbhanga, and Banka districts in the state of Bihar. It is a branch canal of the Kosi Canal, and was constructed in 1903-1904. The canal is about 100 kilometers long, and has a command area of about 100,000 hectares.
The canal irrigates a variety of crops, including rice, wheat, maize, sugarcane, and vegetables. It also provides drinking water to a number of villages in the region.
The Sakri Canal is an important source of irrigation and drinking water for the people of Madhubani, Darbhanga, and Banka districts. It has played a significant role in the development of agriculture and the economy of the region.
Option A is incorrect because the Sakri Canal does not irrigate the lands of Patna, Gaya, and Munger districts.
Option B is incorrect because the Sakri Canal does not irrigate the lands of Purnea, Saharsa, and Darbhanga districts.
Option C is incorrect because the Sakri Canal does not irrigate the lands of East and West Champaran districts.