What Did Reviews of Research on Effective Schools Lead Rutter

What did reviews of research on effective schools lead Rutter and others to conclude?

A) Effective schools are highly eclectic, and there are no consistent patterns regarding teaching or administration, except the enforcement of strict discipline.
B) Effective schools have an academic emphasis, good classroom management of time and atmosphere, firm discipline, and teachers who work as a team.
C) Effective classrooms exist and are dependent on the skills of the individual teacher, but no school has been identified as more effective than others.
D) Effective schools are better funded, have small classes, use open classroom structure, and track students according to ability.