Tucker Carlson interviews Erik Prince, Annapolis graduate, former SEAL officer, former head of Blackwater military contractors. Prince reveals that in the winter of 2008, a group of Democrat senators visited Afghanistan. Their helicopter was forced to land in a snowstorm. A military patrol was unable to find them, but Blackwater did.

Carlson: So you rescued Joe Biden and John Kerry?
Prince: Afraid so.

Was this:
A) Irony
B) Sarcasm
C) A frank expression of deep regret