From what age may one vote in municipal elections in Baden-Württemberg?

EDITORIAL LEARNING AID

Why is this answer correct?

In Baden-Württemberg you may vote in municipal elections from the age of 16, for example for the municipal council. At 14 you are still too young, 18 is the voting age for state and federal elections, and there is no voting age of 20.

Local elections in Baden-Württemberg: at the ballot box from 16.

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