There is a clear difference between the choices with respect to supraliminal and subliminal. The passage clearly tells us that Packard believed in supraliminal images, not subliminal. Thus 1 and 4 go out. We have to choose between 2 and 3 . Statement 3 says people are aware, while statement 2 says that people are not aware. The passage too says that people are not aware. Thus option 2 is the best choice. This was a very simple question.