Correct Option: C

It is one of the world’s largest railway networks comprising 115,000 km (71,000 mi) of track over a route of 65,000 km (40,000 mi) and 7,500 stations. IR carries about 7,500 million passengers annually or more than 20 million passengers daily (more than a half of which are suburban passengers) and 2.8 million tons of freight daily.