Teachers who group students for collaborative project work must ensure that each student has responsibility for part of the task —.
A) so that parents can also help students to set more attainable goals
B) because academic motivation is important not only for schooling but also for the future
C) since feedback typically informs students whether they are correct or incorrect
D) so that the bulk of the work is not done by one or two students
E) as teachers might need to work with students to set realistic goals