The correct answer is: B. Madgaon railway station
Madgaon railway station is the largest railway station in Goa. It is located in the city of Madgaon, which is about 30 kilometers from Panaji, the capital of Goa. The station is well-connected to other parts of India by rail. It is also a major stop for trains from Mumbai and Chennai.
Vasco-da-Gama railway station is located in the city of Vasco-da-Gama, which is about 30 kilometers from Panaji. The station is a major stop for trains from Mumbai and Chennai. However, it is not as well-connected to other parts of India as Madgaon railway station.
Karmali railway station is located in the town of Karmali, which is about 10 kilometers from Panaji. The station is a major stop for trains from Mumbai and Chennai. However, it is not as well-connected to other parts of India as Madgaon railway station.
Therefore, the best station for Goa is Madgaon railway station. It is the largest railway station in Goa, and it is well-connected to other parts of India.