Option 1: Amoghavarsha I was one of the greatest rulers of the Rashtrakuta Empire, but he wasn`t the founder. He was known for his negotiations and peace treaty with the Pallavas and for his contributions to literature.

Option 2: Dantidurga is the correct answer. He is considered to be the founder of the Rashtrakuta Empire in the Deccan region of India, during the period of late 8th century. He overthrew the rule of the Chalukya dynasty and laid the foundation for what became a powerful empire in India.

Option 3: Dhruva was also a ruler of the Rashtrakuta Empire, notably crushing the revolt in Gujarat and effectively dealing with invasions from the Arab world. Despite his great reign, he wasn`t the founder of the empire.

Option 4: Krishna I was another significant ruler from the Rashtrakuta dynasty, known particularly for the construction of the Kailasanath Temple at Ellora. He, however, was not the founder of the empire.