What Differences Exist Between Teacher Expectations for High-Achieving Students and for Low-Achieving

What differences exist between teacher expectations for high-achieving students and for low-achieving students?

A) Teachers wait longer for low-achieving students to respond to questions.
B) Teachers are friendlier to high-achieving students.
C) Teachers seat low-achieving students near their desks,so they can monitor their progress.
D) Teachers criticize low-achieving students less than high-achieving students.