Researchers State That One Reason the Jigsaw Classroom Is Effective

Researchers state that one reason the jigsaw classroom is effective is that it allows the individual to develop a category of "oneness." By this he means that

A) everyone, without exception, is seen as part of a single group.
B) the individual sees him or herself as an individual separate from the group.
C) in-groups are seen as superior to out-groups, bolstering self-esteem.
D) out-groups are seen as a single, homogeneous unit separate from the in-group.