The correct answer is:
at the residents' registration office
beim Einwohnermeldeamt
Independent study resource, not a BAMF website. Translations are study aids; the exam is in German.
Quick explanation
After moving, you must register at the residents’ registration office (Einwohnermeldeamt).
Why is this correct?
Registration must take place within two weeks of moving in; in many cities the office is now called the citizens’ office (Bürgeramt).
Background
Germany has a registration requirement: anyone moving into a new home must register with the registration authority within two weeks (Section 17 of the Federal Registration Act). You need an ID document and a confirmation from your landlord. After registering, you receive a registration certificate, which you often need for banks, employers or authorities. Anyone who does not register can be fined. In many cities you can book an appointment online.
Why are the other answers wrong?
The registry office (Standesamt) is responsible for births, marriages and deaths. The public order office deals with public order, and the trade office with registering a business.
Memory tip
Moving → two weeks → residents’ registration office (Bürgeramt).
Legal basis: Sec. 17 Federal Registration Act ↗
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