If you use Painful Choice and select 3 Archfiend of Gilfer do the 3 of there effects activates?

Yes, Archfiend of Gilfer's effect can be used with Painful Choice, since it says Graveyard not "Destroyed in Battle" and etc...

Yes because

1. It just has to be sent to the graveyard in some way

2. Hitting the graveyard was the LAST thing to happen.

So you will be able to activate all 3 Gilfer effect's.

Thanks a lot :) i needed to confirm that because someone told me that you could only activate one because the other two are not the last thing to happen in a chain