When Sperling Visually Displayed Three Rows of Three Letters Each

When Sperling visually displayed three rows of three letters each for only one-twentieth of a second,research participants

A) recalled only half the letters because they did not have enough time to see all of them.
B) recalled only about seven of the letters due to storage limitations.
C) had a momentary photographic memory of all nine letters.
D) formed a sensory memory of no more than a single letter.