Who heads the German Federal Cabinet?

EDITORIAL LEARNING AID

Why is this answer correct?

The Federal Chancellor chairs the Federal Cabinet and determines the guidelines of policy (Art. 65 GG). The President of the Bundestag (a), the Federal President (b) and the President of the Bundesrat (c) head other constitutional bodies.

The Chancellor heads the cabinet with his power to set policy guidelines.

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