One of the Most Widely Cited Articles in Psychology Is

One of the most widely cited articles in psychology is George Miller's (1956) article on the size of short-term memory. According to your text, this article was important in cognitive psychology because

A) it clearly established the rigid limits of short-term memory's size.
B) it demonstrated that short-term memory was distinctly different from long-term memory.
C) it focused on a cognitive process-mentally converting the stimulus-at a time when most psychologists focused on people's external behavior.
D) it showed that the key to the limits of short-term memory was the amount of time required to pronounce the stimuli.