Champa was the capital of which one of the following Mahajanapadas in Ancient India?

Anga and other Mahajanapadas in the Post Vedic period - Anga was an ancient Indian kingdom that flourished on the eastern Indian subcontinent and one of the sixteen mahajanapadas ("large state"). It lay to the east of its neighbour and rival, Magadha, and was separated from it by the river Champa.