The correct answer is: a) Harshavardhana.
Bhaskaravarman was a prominent ruler of the Kamarupa Kingdom, who ruled from 600 to 650 CE. He was known for his alliance with Harshavardhana, the ruler of the Gupta Empire. The two rulers were allies against the Chalukya Empire, which was ruled by Pulakeshin II.
Harshavardhana was a powerful ruler who expanded the Gupta Empire to its greatest extent. He was also a patron of the arts and literature. Bhaskaravarman was a wise and just ruler who is credited with bringing peace and prosperity to the Kamarupa Kingdom.
The Chalukya Empire was a powerful empire that ruled over much of southern India. Pulakeshin II was a great warrior who defeated the Gupta Empire and expanded the Chalukya Empire to its greatest extent.
The alliance between Bhaskaravarman and Harshavardhana was a powerful one that helped to keep the Chalukya Empire in check. The two rulers were able to defeat the Chalukyas in several battles and prevent them from expanding further into northern India.
The alliance between Bhaskaravarman and Harshavardhana was a significant event in Indian history. It helped to prevent the Chalukya Empire from becoming too powerful and it also helped to promote peace and prosperity in northern India.