Neisser's Research Involving Subjects Searching for Particular Letters in Long

Neisser's research involving subjects searching for particular letters in long strings of similar or dissimilar letters suggested that

A) novel stimuli are easily identifiable.
B) stimuli with common features are recognized as being similar.
C) a stimulus with uncommon features is more readily identified in a group of stimuli.
D) stimuli that are grouped together are seen as a unit.
E) it is easier to detect a stimulus that is grouped with other similar stimuli.