The correct option is D Pushyabhuti
The Gupta Empire which had flourished for two centuries,disintegrated around 6th century C.E. Many small kingdoms sprang up at this time. The kingdom of the Vardhanas was one of them. They ruled from Thaneswar in 6th century. Some copper inscriptions, Banas Harshacharita and the Chinese traveller, Hiuen Tsangs writings throw light upon this period. Pushyabhuti is the founder of this dynasty. Prabhakaravardhana and Harshavardhana are the prominent kings of the dynasty. After the death of his father, Prabhakaravardhana, and his brother, Rajyavardhana, Harsha became the king of Thaneswar.