Participants in Sperling's Experiment Stared at a Screen on Which

Participants in Sperling's experiment stared at a screen on which three rows of letters were flashed for just one-twentieth of a second. If Sperling sounded a high-pitched, medium-pitched, or low-pitched tone within _____, the person could recall the letters in the upper, middle, or lower row.

A) one minute
B) thirty seconds
C) three seconds
D) one-third of a second