The correct answer is A. Banabhatta.
Harshacharitam is a Sanskrit biography of Harshavardhana, the sixth-century emperor of the Vardhana dynasty. It was written by Banabhatta, a court poet of Harshavardhana. The Harshacharitam is considered to be one of the greatest works of Sanskrit literature.
Banabhatta was born in the 7th century in the village of Banavasi in Karnataka. He was a brilliant scholar and poet, and he served as the court poet of Harshavardhana for many years. Banabhatta is also the author of several other works, including the Kadambari and the Dashakavatara.
The Harshacharitam is a long poem that tells the story of Harshavardhana’s life from his birth to his death. The poem is divided into seven books, and it is written in a variety of meters. The Harshacharitam is a valuable source of information about the history of the Vardhana dynasty, and it is also a beautiful work of literature.
The other options are incorrect. Ishadas Rachit is not a person, and Nath Sect is a religious sect.