For how many years is the Landtag of Baden-Württemberg elected?

EDITORIAL LEARNING AID

Why is this answer correct?

The Landtag in Stuttgart is elected for five years. Three years and six years are unusual for parliaments in Germany, and four years apply, for example, to the Bundestag, not to the Landtag.

State elections in Baden-Württemberg: every five years.

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