【单选题】Suppose you find $20. If you choose to use the $20 to go to the football , your opportunity cost of going to the is
A.
nothing, because you found the money.
B.
$20 (because you could have used the $20 to buy other things).
C.
$20 (because you could have used the $20 to buy other things) plus the value of your time spent at the .
D.
$20 (because you could have used the $20 to buy other things) plus the value of your time spent at the , plus the cost of the dinner you purchased at the .