The correct answer is option 'C' - Gujarat.

The Blackbuck National Park, also known as the Velavadar National Park, is situated in the Indian state of Gujarat. It is located in the Bhal region of Saurashtra peninsula, near the Gulf of Khambhat. The park covers an area of approximately 34 square kilometers.

Importance of the Blackbuck National Park:
The Blackbuck National Park is of great importance due to its rich biodiversity and specifically for the conservation of the blackbuck species. It was established in 1976 with the aim to protect the endangered blackbuck antelope, which is the flagship species of the park. The park is also home to various other wildlife species and provides a safe habitat for them.

Key Features of the Blackbuck National Park:
1. Blackbuck Antelope: The park is known for its large population of blackbuck antelope. These elegant and swift animals are considered sacred and have cultural significance in the region.

2. Grassland Ecosystem: The park primarily consists of grasslands, which are the natural habitat of the blackbuck antelope. The open grasslands provide ample grazing opportunities for the herbivorous animals.

3. Avifauna: The park is also a haven for birdwatchers as it hosts a diverse range of avifauna. It is home to over 130 species of birds, including the endangered Lesser Florican, Stoliczka's Bushchat, and the Sarus Crane.

4. Other Wildlife: Apart from blackbucks, the park is also home to other wildlife species such as the Indian wolf, striped hyena, golden jackal, jungle cat, and Indian fox. Various reptiles and insects can also be found in the park.

5. Conservation Efforts: The Blackbuck National Park has been successful in conserving the blackbuck population, which was once on the brink of extinction. The park has implemented measures to protect their habitat, control poaching, and mitigate human-wildlife conflicts.

Tourism and Visitor Facilities:
The Blackbuck National Park attracts nature enthusiasts, wildlife photographers, and researchers from all over the world. It offers various facilities for visitors, including guided safaris, interpretation centers, and nature trails. The park also has accommodation options for tourists to stay and explore the wildlife at their leisure.

In conclusion, the Blackbuck National Park in Gujarat is an important conservation area that protects the endangered blackbuck antelope and provides a safe habitat for various other wildlife species. Its grassland ecosystem and diverse avifauna make it a must-visit destination for nature lovers and wildlife enthusiasts.