Correct Option: A

Nathu La is a mountain pass in the Himalayas. It connects the Indian state of Sikkim with China’s Tibet Autonomous Region. The pass, at 4,310 m above mean sea level, forms a part of an offshoot of the ancient Silk Road. On the Indian side, the pass is 54 km east of Gangtok, the capital of Indian state of Sikkim on JN Marg and only citizens of India can visit the pass, that too after obtaining a permit in Gangtok. Nathu La is one of the three open trading border posts between China and India; the other two are Shipkila in Himachal Pradesh and Lipulekh (or Lipulech) in Uttarakhand