Altona is one of Hamburg’s seven boroughs.

Distinguish borough, borough office and district assembly.

Altona first identifies the territory. The Bezirksamt is its administrative office, which handles assigned local responsibilities. The Bezirksversammlung is the elected body that participates in this work under the relevant law. The same place name may therefore appear alongside different institutions on an invitation.

A borough contains several neighbourhoods. For example, Ottensen is in Altona borough. Someone following a local street proposal in Ottensen is therefore also dealing with Altona’s borough administration. The question itself, however, only asks for the name of the Hamburg borough.

The other three answers

The other three names identify places outside Hamburg.

Altona is not a separate federal state.

Hamburg’s constitution does not separate state and municipal functions. Boroughs handle local work within Hamburg. A district assembly is therefore not the state parliament, which is called the Bürgerschaft in Hamburg.

The English question uses borough. In other contexts, Bezirk may also be translated as district. The decisive point is the specific connection to Hamburg, rather than assuming an English term has the same meaning everywhere. Learn the association Altona–Hamburg.