The correct answer is option 'C', Ajanta.

Ajanta is a mountain range located in the Aurangabad district of Maharashtra, India. It is spread over only one state in India, which is Maharashtra. The Ajanta mountain range is famous for its Ajanta Caves, a UNESCO World Heritage Site.

Let's explore some more details about the Ajanta mountain range:

1. Location:
- The Ajanta mountain range is located in the western part of India, specifically in the Aurangabad district of Maharashtra.
- It is situated approximately 100 kilometers from Aurangabad city.

2. Geography:
- The Ajanta mountain range is a part of the Satpura Range, which extends across multiple states in central India.
- However, Ajanta itself is confined within the boundaries of Maharashtra.

3. Ajanta Caves:
- The Ajanta Caves, located within the Ajanta mountain range, are a series of 30 rock-cut Buddhist cave monuments.
- These caves date back to the 2nd century BCE and 6th century CE and are renowned for their exquisite rock-cut sculptures and frescoes.
- The caves provide valuable insights into ancient Buddhist art, architecture, and culture.

4. Importance:
- The Ajanta Caves are a significant cultural and historical site in India.
- They showcase the development and evolution of Buddhist art in India over several centuries.
- The caves also depict various Jataka tales (stories of the previous lives of Buddha) through their intricate carvings and paintings.

5. Tourism:
- The Ajanta Caves attract a large number of tourists from all over the world.
- Visitors can explore the beautifully carved caves and admire the ancient art and craftsmanship.
- The site is well-preserved and maintained by the Archaeological Survey of India.

In conclusion, the Ajanta mountain range is spread over only one state in India, which is Maharashtra. It is famous for the Ajanta Caves and is an important cultural and historical site.