The correct answer is option 'B' - Himalayas.

The Nathu la and Jelep la Passes are located in the Himalayan mountain range. These passes are significant geographical features that connect India with its neighboring countries. Let's explore these passes in more detail.

1. Nathu la Pass:
- Located in the state of Sikkim, Nathu la Pass is one of the oldest trading routes between India and Tibet (China).
- It is situated at an altitude of 4,310 meters (14,140 feet) above sea level.
- Nathu la Pass is a strategic location as it provides a direct route for trade and pilgrimage between India and China.
- The pass was closed after the 1962 Sino-Indian War but was re-opened in 2006 for limited trade and movement of pilgrims.
- It is an important part of the ancient Silk Route and offers breathtaking views of the surrounding Himalayan peaks.

2. Jelep la Pass:
- Jelep la Pass is also located in the state of Sikkim, near the Indo-China border.
- It lies at an elevation of 4,267 meters (13,999 feet) above sea level.
- This pass is another historic trade route that connects India with Tibet (China) and was once an important part of the Silk Route.
- Jelep la Pass provides access to the beautiful Chumbi Valley in Tibet and is known for its scenic beauty.
- It is also used for military purposes and has witnessed significant historical events, including the 1903 British expedition to Tibet.

3. The Himalayas:
- The Himalayas are a vast mountain range located in South Asia, spanning across several countries including India, Nepal, Bhutan, and China.
- It is the highest mountain range in the world, with several peaks exceeding 8,000 meters (26,000 feet) in elevation, including Mount Everest, the highest peak on Earth.
- The Himalayas serve as a natural barrier, separating the Indian subcontinent from the Tibetan Plateau and Central Asia.
- This mountain range is known for its rich biodiversity, diverse cultures, and challenging terrains, attracting mountaineers, trekkers, and nature enthusiasts from around the globe.

In conclusion, Nathu la and Jelep la Passes are located in the Himalayan mountain range. These passes have historical and strategic significance, connecting India with Tibet (China) and offering breathtaking views of the majestic Himalayan peaks.