How many federal states joined the Federal Republic of Germany during reunification in 1990?

EDITORIAL LEARNING AID

Why is this answer correct?

For the “Leben in Deutschland” test, connect “5” with the meaning of the question. This is the answer marked as correct in the official key. “4” is not part of the solution and points to a different issue. Learn the key term together with the complete correct answer instead of memorising only its letter.

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