Which federal state is North Rhine-Westphalia?

EDITORIAL LEARNING AID

Why is this answer correct?

On the map for this question, North Rhine-Westphalia carries the number 3; the state lies in the west of Germany and borders the Netherlands and Belgium. The other numbers designate other federal states and are therefore wrong.

NRW: in the west, bordering Belgium and the Netherlands.

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