Many Advocates of Cooperative Learning Recommend That the Most Effective

Many advocates of cooperative learning recommend that the most effective cooperative groups are those that include a wide range of student ability levels.How can we best summarize research findings regarding the effectiveness of different kinds of groups?

A) Heterogeneous grouping maximizes student achievement.
B) Low-ability students do better when placed with high-ability students, but middle-ability students work best with students very similar to themselves in ability.
C) High-ability students rarely benefit from working with low-ability students.
D) Research results are inconclusive with regard to the optimal range of ability levels within a particular group.