The correct answer is: C. Nagabhatta I
Nagabhatta I was the founder of the Pratihara dynasty, which ruled over Malwa, Rajputana, and Gujarat from the 7th to the 10th centuries. He was a powerful ruler who expanded his kingdom significantly. He is also credited with building many temples and other monuments.
Harichandra was a king of the Chalukya dynasty who ruled over the Deccan region in the 7th century. He was a powerful ruler who fought many successful battles against his enemies. He is also credited with building many temples and other monuments.
Vatsaraja was a king of the Gurjara-Pratihara dynasty who ruled over Malwa in the 8th century. He was a powerful ruler who fought many successful battles against his enemies. He is also credited with building many temples and other monuments.
Nagabhata II was a king of the Pratihara dynasty who ruled over Malwa in the 9th century. He was a powerful ruler who fought many successful battles against his enemies. He is also credited with building many temples and other monuments.
In conclusion, the correct answer is: C. Nagabhatta I.