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

1. A

   Andhra

   Andhra. Dhanyakataka (Dharanikota / Amaravati) on the Krishna was a Mahasanghika centre.

2. B

   Gandhara

   Gandhara. Taxila–Peshawar; a different Buddhist landscape.

3. C

   Kalinga

   Kalinga. Odisha; Ashokan, later Buddhist, but not this town.

4. D

   Magadha

   Magadha. Heartland of early Buddhism, not Dhanyakataka.

Summary. Official key is (a) Andhra. Dhanyakataka, at Dharanikota near Amaravati in the Krishna valley, was a major Mahasanghika (and later Mahayana) centre. Gandhara, Kalinga and Magadha are other Buddhist geographies.