Gass & Seiter's View of Using Subliminal Messages to Persuade

Gass & Seiter's view of using subliminal messages to persuade is that

A) subliminal messages are effective, but they are highly unethical.
B) subliminal messages are ineffective, so from an ethical standpoint, they are irrelevant.
C) product planting is ethical, but subliminal persuasion is not.
D) subliminal persuasion should be regulated by the government, not by the private sector.