The correct answer is: A) Bengaluru City Junction
Bengaluru City Junction is the major railway junction in Karnataka, connecting various parts of the country. It is one of the busiest railway stations in India, with over 3 million passengers traveling through it every day. The station is located in the heart of Bengaluru, and is well-connected to other parts of the city by bus, metro, and taxi.
Mysuru Junction is the second busiest railway station in Karnataka, and is located in the city of Mysuru. The station is well-connected to other parts of the state by rail, and is also a popular tourist destination.
Hubballi Junction is the third busiest railway station in Karnataka, and is located in the city of Hubballi. The station is well-connected to other parts of the state by rail, and is also a major commercial hub.
Mangalore Junction is the fourth busiest railway station in Karnataka, and is located in the city of Mangalore. The station is well-connected to other parts of the state by rail, and is also a major port city.