Which Statement Concerning Opportunity Costs Is False

Which statement concerning opportunity costs is false?

A) Opportunity costs can always be expressed in money terms.
B) Every choice involves opportunity costs.
C) Opportunity costs are the highest-valued alternatives that must be forgone when a choice is made.
D) The full cost of an activity includes the opportunity costs.
E) Economists refer to the forgone benefits of the next-best alternative as opportunity costs.