The correct answer is B) Kaveri (Cauvery).
The Kaveri river basin is the largest river basin in Karnataka, covering an area of about 120,000 square kilometers. The river originates in the Western Ghats and flows through the states of Karnataka, Tamil Nadu, and Kerala. The Kaveri is a major source of irrigation for agriculture in Karnataka, and sugarcane is one of the major crops grown in the river basin.
The other options are incorrect because they are not major river basins in Karnataka. The Krishna river basin is located in the southern part of the state, while the Tungabhadra river basin is located in the central part of the state. The Godavari river basin is located in the eastern part of the state.
The Kaveri river basin is a major agricultural region in Karnataka. The main crops grown in the river basin are sugarcane, rice, and cotton. The Kaveri river is also a major source of drinking water for the people of Karnataka.