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

Dhanyakataka is the ancient name for Amaravati (located in the Guntur district of present-day **Andhra**), which served as a major capital for the Satavahanas and a flourishing center for the Mahasanghika sect. While **Magadha** is a tempting choice as the traditional cradle of Buddhism, it refers to the northern Gangetic heartland, whereas Dhanyakataka was a distinct southern hub. The core concept being tested is the **historical geography of ancient India** and the regional development of early Buddhist schools.