Suppose Gina decides to eat the almonds. Which result would be a cost?

 - Gina will give up the chance to eat the fudge. Gina thinks fudge would have tasted better than almonds will.
 - Gina will get to eat the almonds. The almonds will be healthier than the fudge would have been.
This result is a cost. It involves giving up or spending something that Gina wants or needs:
Gina will give up the chance to eat the fudge. Gina thinks fudge would have tasted better than almonds will.