The correct answer is (a) Somdeva.
Somdeva was a Kashmiri writer who lived in the 12th century. He is best known for his work, the Kathasaritasagara, which is a collection of stories and anecdotes. The Kathasaritasagara is considered to be one of the most important works of Sanskrit literature.
Kalhana was a Kashmiri historian who lived in the 12th century. He is best known for his work, the Rajatarangini, which is a chronicle of the history of Kashmir. The Rajatarangini is considered to be one of the most important works of Kashmiri literature.
Rajshekhar was a Sanskrit poet who lived in the 10th century. He is best known for his work, the Kavyamimansa, which is a treatise on poetics. The Kavyamimansa is considered to be one of the most important works of Sanskrit literature.
Bilhana was a Sanskrit poet who lived in the 11th century. He is best known for his work, the Vikramankadevacarita, which is an epic poem about the life of the king Vikramaditya. The Vikramankadevacarita is considered to be one of the most important works of Sanskrit literature.