Guru Ghasidas National Park is located in Chhattisgarh, which is option 'D' in the given choices. It is a significant wildlife reserve in India and has been in the news for various reasons. Let's explore the details of this national park:

Location and Overview:
- Guru Ghasidas National Park is situated in the Koriya district of Chhattisgarh, India.
- It covers an area of approximately 1,445 square kilometers.
- The national park is named after Guru Ghasidas, who was a social reformer and a spiritual leader from the Satnami community.

Flora and Fauna:
- The park is known for its rich biodiversity and is home to a variety of flora and fauna.
- It primarily consists of tropical moist deciduous forests and is characterized by hilly terrains, deep valleys, and water bodies.
- The vegetation in the park includes species like sal, teak, bamboo, tendu, mahua, and more.
- The national park is inhabited by several species of mammals, birds, reptiles, and amphibians.
- Some of the prominent animal species found here are tigers, leopards, sloth bears, wild boars, sambar deer, chital, chinkara, and more.
- The park is also a paradise for birdwatchers with a wide range of avian species, including peafowls, parrots, hornbills, mynas, and many others.

Conservation and Importance:
- Guru Ghasidas National Park is recognized as an important conservation area in the state of Chhattisgarh.
- It serves as a crucial wildlife corridor connecting other protected areas in the region, facilitating the movement of animals.
- The park not only helps in preserving the biodiversity but also contributes to the local economy through tourism.
- It offers opportunities for wildlife enthusiasts, nature lovers, and researchers to study and appreciate the diverse ecosystems present in the region.

Threats and Conservation Efforts:
- Like many other natural habitats, Guru Ghasidas National Park also faces various threats.
- Encroachment, illegal logging, poaching, and habitat fragmentation are some of the major challenges.
- To address these issues, the government and conservation organizations have implemented several measures.
- Increased patrolling, awareness campaigns, community involvement, and strict law enforcement are some of the steps taken to protect the park and its wildlife.

In conclusion, Guru Ghasidas National Park is located in Chhattisgarh, making option 'D' the correct answer. It is a vital conservation area known for its rich biodiversity and serves as a habitat for numerous plant and animal species. Efforts are being made to safeguard the park and address the threats it faces to ensure the preservation of its natural heritage.