Option d is the correct answer. Prabhakarvardhana was the founder of the Vardhana dynasty, also known as the Pushyabhuti dynasty. They were feudatories of the Guptas empire. It ruled over parts of northern India from the 6th to the 7th century CE. Prabhakarvardhana was a powerful king who defeated the Hunas and performed the Ashvamedha sacrifice. He was also a patron of Buddhism and Jainism. He had two sons, Rajyavardhana and Harshavardhana, and a daughter, Rajyashri. Rajyavardhana succeeded him but was killed by the ruler of Malwa. Harshavardhana then avenged his brother's death and became one of the greatest emperors of India.