What colours does the state flag of Brandenburg have?

EDITORIAL LEARNING AID

Why is this answer correct?

The Brandenburg state flag is red and white and shows the red eagle in the centre. Blue-white-red is the flag of Schleswig-Holstein, green-white-red that of North Rhine-Westphalia and black-yellow that of Baden-Württemberg.

Red and white with a red eagle: Brandenburg.

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