Which federal state is Lower Saxony?

EDITORIAL LEARNING AID

Why is this answer correct?

On the map for this question, Lower Saxony is marked with the number 1; the state lies in the north-west of Germany and reaches the North Sea. The other numbers stand for other federal states and are therefore wrong.

Lower Saxony: north-west, North Sea coast, number 1.

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