The Nilgiris are part of the Western Ghats.

The Nilgiris, also known as the Blue Mountains, are a part of the Western Ghats mountain range in India. Let's understand why the correct answer is option 'B' in more detail:

1. Introduction to the Nilgiris:
- The Nilgiris is a mountain range located in the southern Indian state of Tamil Nadu.
- It is a UNESCO World Heritage Site and is known for its beautiful landscapes, lush greenery, and rich biodiversity.

2. Western Ghats:
- The Western Ghats is one of the major mountain ranges in India, running parallel to the western coast.
- It is a UNESCO World Heritage Site and is recognized as one of the eight "hottest hotspots" of biological diversity in the world.
- The range stretches approximately 1,600 km from the Gujarat-Maharashtra border to the southern tip of India.
- The Western Ghats are home to numerous hill stations, national parks, and wildlife sanctuaries.

3. Geographical Location of the Nilgiris:
- The Nilgiris are located in the western part of Tamil Nadu, bordering Kerala and Karnataka states.
- They are situated at the junction of the Western Ghats and the Eastern Ghats.
- The Nilgiris are known for their distinct climate, with cooler temperatures and misty surroundings.

4. Connection with the Western Ghats:
- The Nilgiris are an integral part of the Western Ghats mountain range.
- The Western Ghats extend into the Nilgiris, and the region is characterized by its hilly terrain, dense forests, and unique flora and fauna.
- The Nilgiris are often considered as the "Queen of the Western Ghats" due to their natural beauty and ecological significance.

Conclusion:
In conclusion, the Nilgiris are part of the Western Ghats mountain range. Although they are located at the junction of the Western Ghats and the Eastern Ghats, their inclusion in the Western Ghats is due to their geographical and ecological connection with this mountain range.