The district located at the northernmost tip of Karnataka:

The correct answer is: B) Vijayapura

Vijayapura is a city in the Indian state of Karnataka. It is the headquarters of the Vijayapura district and is located in the northern part of the state. The city is known for its historical monuments, including the Gol Gumbaz, a mausoleum built by the Adil Shahi rulers. Vijayapura is also a major commercial and industrial center.

The other options are incorrect because they are not located in the northernmost tip of Karnataka.

• Belagavi is located in the northern part of Karnataka, but it is not the northernmost district.
• Bidar is located in the northern part of Karnataka, but it is not the northernmost district.
• Kalaburagi is located in the northern part of Karnataka, but it is not the northernmost district.