The correct answer is C. 4290 km.
The North Eastern Frontier Railway (NEFR) is one of the 17 zones of Indian Railways. It is headquartered in Maligaon, Guwahati, Assam. The NEFR is the largest zone in terms of area, covering an area of 1,22,000 sq km. It is also the second largest zone in terms of route length, with a total route length of 4,290 km. The NEFR has a total of 10 divisions, which are:
- Lumding Division
- Tinsukia Division
- Dibrugarh Division
- North Lakhimpur Division
- Golaghat Division
- Jorhat Division
- Silchar Division
- Cachar Division
- Manipur Division
- Nagaland Division
The NEFR is responsible for the operation of railway services in the northeastern states of India. It also provides connectivity to the neighboring countries of Bangladesh and Myanmar. The NEFR is a vital part of the Indian Railways network and plays a key role in the economic development of the northeastern region.
Option A is incorrect. The length of the North Eastern Frontier Railway is not 4300 km.
Option B is incorrect. The length of the North Eastern Frontier Railway is not 3700 km.
Option D is incorrect. The length of the North Eastern Frontier Railway is not 5298 km.