The correct answer is D. Harshacharita.
Harshacharita is a Sanskrit biography of King Harshavardhana of Kannauj, written by Banabhatta in the 7th century. It is one of the most important works of Sanskrit literature and provides a valuable insight into the life and times of King Harsha.
The book is divided into seven chapters, each of which deals with a different aspect of King Harsha’s life. The first chapter describes his birth and early life, the second chapter his education and training, the third chapter his accession to the throne, the fourth chapter his military campaigns, the fifth chapter his religious activities, the sixth chapter his court life, and the seventh chapter his death.
Harshacharita is a valuable source of information on the history of India in the 7th century. It provides a detailed account of the political, social, and cultural conditions of the time. It also gives us a glimpse into the personality of King Harsha, who was a powerful and charismatic ruler.
The other options are incorrect because they are not works of Sanskrit literature that deal with the life of King Harsha.
- Ratnavali is a Sanskrit play written by Harshavardhana himself.
- Nagananda is another Sanskrit play written by Harshavardhana.
- Kadambari is a Sanskrit novel written by Banabhatta.