The correct answer is B. Secunderabad.
The South Central Railway zone is one of the 17 railway zones of Indian Railways. It is headquartered in Secunderabad, Telangana. The zone covers the states of Andhra Pradesh, Telangana, Karnataka, Maharashtra, and parts of Madhya Pradesh and Chhattisgarh. It has a total route length of 6,379 km and operates over 1,000 trains daily.
The South Central Railway zone was formed on 14 April 1957 by merging the Secunderabad Railway Division of the Central Railway and the Hyderabad Railway Division of the Southern Railway. The zone has 10 divisions: Secunderabad, Hyderabad, Vijayawada, Guntur, Nanded, Bhusaval, Raichur, Kurnool, Guntakal, and Latur.
The South Central Railway zone is one of the most important railway zones in India. It plays a vital role in the economic development of the region. The zone is also a major tourist destination.