Who determines school policy in Germany?

EDITORIAL LEARNING AID

Why is this answer correct?

School policy is the responsibility of the federal states (cultural sovereignty, Articles 30 and 70 of the Basic Law); each state has its own school laws. Teachers, the Ministry for Family Affairs and the universities do not determine school policy.

The federal states make school policy (cultural sovereignty).

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.