In Sperling's Investigations of Iconic Memory, Subjects in the Whole

In Sperling's investigations of iconic memory, subjects in the whole report condition:

A) heard a tone that signaled which row they should report, just after the display was presented
B) were asked to report as many letters as possible from the display they had seen
C) were asked to report only a specific portion of the display they had seen
D) typically performed much better than subjects in the partial report condition