The Best Description of the Use of Tracking Is That

The best description of the use of tracking is that it occurs when

A) low-ability and high-ability classes are created at a particular grade level.
B) low-ability and high-ability groups are created within particular classes.
C) low-ability students are matched with high-ability partners in a homogeneous class.
D) special education programs that monitor the progress of each student are developed and used.