After the downfall of Gupta empire, many regional kingdoms emerged in Odisha from 6-9th century AD. Which is not one among them?

Answer: Option C

The Naga dynasty (c. 170 - 350 CE) was the most powerful pre-Gupta monarchy in India. They dominated areas of north-central India in the 3^rd and 4^th centuries, after the Kushan Empire fell apart and before the Gupta Empire rose to power.