Sperling's Classic Experiment in Which He Briefly Flashed Three Rows

Sperling's classic experiment in which he briefly flashed three rows of letters on a screen immediately followed by a tone demonstrated that:

A) subliminal perception can influence unconscious thought processes.
B) auditory sensory memory lasts for three or four seconds.
C) visual sensory memory holds a great deal of information for about a half second.
D) short-term memory can last for up to 30 seconds.