Who elects the Federal Chancellor in Germany?

EDITORIAL LEARNING AID

Why is this answer correct?

The Bundestag elects the Federal Chancellor with a majority of its members (Art. 63 GG). The Bundesrat (a) participates in legislation, the Federal Assembly (b) elects the Federal President, and the people (c) only elect the members of parliament.

The Bundestag elects the Chancellor, the Federal Assembly the President.

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