How to respond to "o tɛ wa"? ("Right?")

How is one to respond when ask “right?”, o tɛ wa? which sounds like o tɛa many times.
Would you respond o don or o de ?

I ni ce! You can respond in various ways. O don works great!

If you are asking about O de because it is something that you’ve heard then it’s likely because sometimes people put the focalization market de (or le [especially in Jula and Maninka]) after the word o. And in some cases, they might then even drop the copula don:

O de don!