Which is the Longest Passenger Rail road in India ?

Options:
A) Kanyakumari to Dibrugarh (Vivek Express)
B) Jamuthavi (JammuKasmir) to Guwahati
C) Thiruvananthapuram to Jamuthavi (JammuKasmir)
D) Thiruvananthapuram to Guwahati
 
Answer : Kanyakumari to Dibrugarh (Vivek Express)