The correct answer is option 'C' - Both of them.

Explanation:
Rajatarangini:
- Rajatarangini is a historical chronicle of the kings of Kashmir written by Kalhana, a Kashmiri historian, in the 12th century.
- It is considered one of the most important sources of information about the history and culture of Kashmir.
- Rajatarangini covers the history of Kashmir from ancient times to the 12th century, tracing the lineage of the kings and providing details about their reigns, achievements, and challenges.
- The work is divided into eight books, known as Tarangas, and includes narratives, legends, myths, and historical accounts.
- Rajatarangini is written in Sanskrit and is highly regarded for its literary and poetic qualities.

Katha Sarit Sagar:
- Katha Sarit Sagar, also known as the "Ocean of Stories," is a collection of Indian folktales compiled by Somadeva, a Kashmiri poet, in the 11th century.
- The work is written in Sanskrit and is a significant contribution to Indian literature and folklore.
- Katha Sarit Sagar consists of numerous stories with various themes, including love, adventure, morality, and supernatural elements.
- The stories are interconnected and often include multiple narratives within a single tale.
- The collection draws inspiration from earlier works such as the Panchatantra and the Jataka tales, but also includes original stories unique to Katha Sarit Sagar.
- The work has been translated into various languages and has influenced storytelling traditions across different cultures.

Conclusion:
Both Rajatarangini and Katha Sarit Sagar are associated with Kashmir. While Rajatarangini is a historical chronicle of the kings of Kashmir, Katha Sarit Sagar is a collection of Indian folktales compiled in Kashmir. Both works are significant contributions to Indian literature and provide insights into the history, culture, and storytelling traditions of the region.