The correct answer is option 3: Rashtrakuta. The Ellora temples were built by the Rashtrakuta rulers. The Rashtrakuta dynasty was a ruling dynasty in the Deccan region of India from the 8th century to the 10th century. They were known for their patronage of arts and culture, and the Ellora temples are a magnificent example of their architectural prowess. The temples at Ellora are a UNESCO World Heritage site and consist of rock-cut caves that showcase a fusion of Hindu, Buddhist, and Jain art and architecture. These temples were created over a span of several centuries, with contributions from multiple rulers. While the Chalukya, Sunga, and Pallava dynasties were also prominent rulers in different regions of India, they were not responsible for the construction of the Ellora temples.