In one high school class, the teacher lets students select their own groups to work on an important class project. As expected, similar students group themselves together. In another class, the teacher randomly divides students into groups, so dissimilar students are often grouped together. Which is likely to be the main advantage of the dissimilar groups over the homogeneous (similar) ones?

a) The dissimilar (heterogeneous) groups will be more cooperative.
b) The dissimilar groups will be more efficient.
c) The dissimilar groups will generate a greater variety of information.
d) The dissimilar groups will have higher morale.