While Studying Health Care Economics, the Nursing Professor Explains to a Class

While studying health care economics, the nursing professor explains to a class that the economic principle of opportunity costs means that:

A) economic decisions are based on the best opportunity that arises.
B) free market failure occurs when efficient use of resources is lacking.
C) satisfying one desire eliminates the possibility of satisfying another.
D) we make our decisions based on opportunities to benefit others.