The state capital of Baden-Württemberg is called …

EDITORIAL LEARNING AID

Why is this answer correct?

The state capital of Baden-Württemberg is Stuttgart; the Landtag and the state government are based there. Heidelberg, Karlsruhe and Mannheim are large and well-known cities in the state, but not the capital.

Stuttgart: state parliament, government and the Mercedes star.

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