What does this picture show?

EDITORIAL LEARNING AID

Why is this answer correct?

The picture shows the plenary chamber of the German Bundestag in the Reichstag building in Berlin. The Federal Constitutional Court (b) is based in Karlsruhe, the Bundesrat (c) meets in the former Prussian House of Lords in Berlin, and the Federal Chancellery (d) is a separate modern building in the government quarter.

The Reichstag in Berlin = seat of the German Bundestag.

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