You are shopping at the local mall with an $80 gift certificate that expires later today. Only three items catch your attention. The items include a Justin Bieber sheet set, a remote control helicopter, and an "Amazing Ab Belt." You would be willing to give up $60 for the sheets, $70 for the belt, and $80 for the helicopter. Knowing this, you decide to purchase the helicopter. The opportunity cost of the helicopter was:
A) $130, the combined value of the alternatives forgone.
B) $60, the value of the sheets.
C) $80, the amount of the gift certificate spent.
D) $70, the value of the ab belt.