The Difference Between Ability Grouping and Cooperative Learning Is That

The difference between ability grouping and cooperative learning is that

A) ability grouping divides a class into a number of small groups, while cooperative learning keeps the entire class together as one group.
B) when using ability grouping, one teacher works with the different groups, while in cooperative learning, different teachers work with the different groups.
C) in an ability group, all students are performing at the same level, while in cooperative learning, the students are at different ability levels.
D) in ability grouping, everyone in the group gets the same grade, but in cooperative learning, each student earns his or her own grade.