George is deciding what to do on Friday night. He can either go to the opera or go to see a play. He decides to go to the opera. He pays $$50$ for a ticket. The opera turns out to be underwhelming, and George is disappointed. He later finds out that the play that he could have seen was actually pretty great.

What was the opportunity cost of George's decision to see the opera?

The regret he felt after finding out that the play was actually pretty great $$50$

The disappointment he felt after seeing the opera

The enjoyment he could have had if he saw the play