The correct answer is: A) Goa and Maharashtra.
The Konkan Railway is a 760-kilometre (470 mi) long railway line in India that runs along the western coast of the country, connecting the states of Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu. It was built between 1982 and 1998 and is one of the most challenging railway lines in the world to construct, due to the difficult terrain it traverses. The Konkan Railway is a vital link between the western and eastern parts of India and is used by millions of passengers every year.
Option B is incorrect because the Konkan Railway does not connect Tamil Nadu and Kerala. The two states are connected by the Southern Railway.
Option C is incorrect because the Konkan Railway does not connect Andhra Pradesh and Telangana. The two states are connected by the South Central Railway.
Option D is incorrect because the Konkan Railway does not connect Odisha and West Bengal. The two states are connected by the East Coast Railway.