Schneider and Shiffrin Asked People to Look for Letters or Numbers

Schneider and Shiffrin asked people to look for letters or numbers in their study of automatic processing.The study demonstrated that

A) the amount of time that the stimuli were exposed did not influence
B) in the consistent mapping tasks, people were just as fast in searching for four items as one
C) on controlled processing tasks, people looked for all four targets simultaneously
D) none of the above