Which statement best describes subliminal perception

A)  Subliminal perception is possible only if sensory adaptation has taken place. 
B)  Although subliminal perception was once dismissed by scientists as preposterous, recent laboratory evidence suggests it has some effects on behaviour. 
C)  Scientists have conclusively demonstrated that perception simply cannot take place without conscious awareness. 
D)  Recent research suggests that subliminal messages can be quite persuasive in convincing us to buy products we don't want.