In which one of the following regions was Dhanyakataka, which flourished as a prominent Buddhist centre under the Mahasanghikas, located?

1. Dhanyakataka, identified with modern Amaravati and Dharanikota in the Guntur district of Andhra Pradesh, was a major ancient city and capital. 2. It flourished as a prominent Buddhist centre, particularly known for its magnificent stupa. 3. Historical sources indicate that Dhanyakataka was closely associated with the Mahasanghikas, one of the early Buddhist schools, and its sub-sects like the Caitikas. 4. Gandhara was in the northwest, Kalinga corresponds to modern Odisha, and Magadha was in present-day Bihar. None of these match the location of Dhanyakataka. 5. Therefore, Dhanyakataka was located in the Andhra region.