AZT Is a Drug That Inhibits the Reproduction of the AIDS

AZT is a drug that inhibits the reproduction of the AIDS virus, thus preventing the full development of the disease.The drug, which is sold in an unregulated market, is very expensive and many AIDS patients who can't afford it die from the disease.This case provides ammunition to critics of the market system on the basis of its

A) fairness.
B) externalities.
C) cost disease in services.
D) inefficiency.