From what age may a person vote in local elections in Thuringia?

EDITORIAL LEARNING AID

Why is this answer correct?

In Thuringia, people may vote in local elections from the age of 16; the Thuringian local election law provides for this age. 14 is too young, 18 applies to Landtag and Bundestag elections, and 20 is not a voting age.

Thuringia: local elections at 16, Landtag at 18.

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