Stephanie has decided to eat lunch between classes. She has ranked her choices, from most- to least-preferred, as: (1) turkey sandwich, (2) tuna sandwich, (3) slice of cheese pizza; (4) cheeseburger. The cafe Stephanie is eating at has run out of turkey sandwiches, so she can't buy one. Her opportunity cost for eating a tuna sandwich is O the value of the cheeseburger. @) the combined value of the turkey sandwich, slice of cheese pizza and cheeseburger, the value of the turkey sandwich the value of the slice of cheese piza