Aut my choice In Sperling's investigations of sensory memory, it was found that Select one: O a Participants recalled very few letters, because they didn't have enough time to see them all Ob Participants could only recall letters in the first and last rows but not in the middle row e Participants only recalled about 7 letters, due to the limits of short term memory d. Participants appeared to have a momentary memory of all letters in the allows