Which federal state is Thuringia?

EDITORIAL LEARNING AID

Why is this answer correct?

Thuringia lies in the centre of Germany and is also called the green heart because of its forests; on the map it bears the number 2. The other numbers stand for other federal states.

Green heart in the middle: Thuringia, number 2.

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