The student center on campus has burritos, bagels, or burgers for lunch, and they all cost
the same. You love burgers and bagels, but you decide to have a burger today. If they
were out of burgers, you would have bought a bagel. This statement best represents this
economic concept:_______-
A) The real cost of something is what you must give up to get it.
B) "How much" is a decision at the margin.
C) Resources are used to produce something else.
D) There are gains from trade.