Suppose Ayana decides to join the Theater Club. Which result would be a cost?

 - Ayana will save some time. She would have spent more time in the Photography Club than in the Theater Club.
 - Ayana will give up the chance to be in the Photography Club. She would have had more fun in the Photography Club than in the Theater Club.
This result is a cost. It involves giving up or spending something that Ayana wants or needs:
Ayana will give up the chance to be in the Photography Club. She would have had more fun in the Photography Club than in the Theater Club.