A married couple wants to open a restaurant in Germany. What do they absolutely need for that?

EDITORIAL LEARNING AID

Why is this answer correct?

Anyone opening a restaurant needs a restaurant licence from the competent authority (§ 2 Restaurant Act); depending on the business, further proofs such as hygiene training are added. The police (a), political parties (b) and the residents' registration office (c) do not issue such a licence.

Opening a restaurant: do not forget the restaurant licence from the authority.

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