Rosenthal and Jacobson's Book Pygmalion in the Classroom Draws Attention

Rosenthal and Jacobson's book Pygmalion in the Classroom draws attention to the fact that

A) the cultural compatibility hypothesis is often invisible.
B) stereotype threats can be unwittingly perpetuated by teachers.
C) the Flynn effect renders many teaching references outdated.
D) teachers' expectations can affect the results they obtain from their students.