The phrase "clash of cultures" between students and teachers refers to?

[Poor]

The phrase "clash of cultures" between students and teachers refers to
A. the fact that violence in schools is increasing.
B. the fact that a majority of teachers are European American, while students reflect a far greater cultural diversity.
C. the fact that classrooms are overcrowded.
D. the fact that school reform efforts do not take diversity into account.

[Judith]

From your selection, I say "D".

But also, I think it describes the differences between how teachers talk/think/act and how students talk/think/act.