The correct answer is D. Assaka.
Gandhara was a region in the northwest of the Indian subcontinent, now part of modern-day Afghanistan and Pakistan. Magadha was a kingdom in the eastern Indian subcontinent, now part of modern-day Bihar and Jharkhand. Kosala was a kingdom in the central Indian subcontinent, now part of modern-day Uttar Pradesh. Assaka was a kingdom in the Deccan region of the Indian subcontinent, now part of modern-day Telangana.
Assaka was one of the sixteen Mahajanapadas, or great kingdoms, of ancient India. It was located in the Telangana region of modern-day India. The capital of Assaka was Potaliputra, which is now known as Hyderabad.
Assaka was a powerful kingdom during the 6th and 5th centuries BCE. It was ruled by a number of powerful kings, including Simuka, Kharavela, and Ajatashatru. Assaka was eventually conquered by the Mauryan Empire in the 4th century BCE.
The kingdom of Assaka was known for its wealth and prosperity. It was also a center of learning and culture. The city of Potaliputra was home to a number of universities and temples.
Assaka was a significant kingdom in the history of ancient India. It played an important role in the development of Indian culture and society.