Correct Option: A
The Gupta Empire was an ancient Indian empire which existed from approximately 320 to 550 CE and covered much of the Indian Subcontinent. Scholars of this period include Varahamihira and Aryabhatta, who is believed to be the first to come up with the concept of zero, postulated the theory that the Earth moves round the Sun, and studied solar and lunar eclipses. The most famous works of Aryabhatta are the Aryabhatiya and the Arya-siddhanta. Varahamihira was an Indian astronomer, mathematician, and astrologer who lived in Ujjain. He is considered to be one of the nine jewels (Navaratnas) of the court of legendary ruler Vikramaditya (thought to be the Gupta emperor Chandragupta II Vikramaditya).