Why Has the Amount of Prescription Drug Advertising Skyrocketed in the Past

Why has the amount of prescription drug advertising skyrocketed in the past few years?

A) The FTC loosened its controls on pharmaceutical companies.
B) The FCC loosened its controls on pharmaceutical companies.
C) Demographic shift in U.S. population reflects an aging population, and they tend to be heavy users of prescription drugs causing more competition in the industry and thus more advertising.
D) The FDA loosened its controls on pharmaceutical companies.
E) Patents held by many pharmaceutical companies expired, resulting in price competition and heavy advertising.