One event provides the date for broader remembrance.
The parentheses in the correct answer explain why that date was chosen. They do not restrict remembrance to Auschwitz. The day commemorates people deprived of rights, persecuted and murdered under Nazi rule.
Liberation here means that the surviving prisoners were freed from the camp’s control. It could not undo the murders already committed. The date therefore connects remembrance of the crimes with the end of captivity for survivors.

The other three answers
The other answers point to different historical contexts.
the end of World War II
Auschwitz was liberated while the Second World War was still continuing. 27 January is therefore not the date on which the war ended.
the adoption of the Basic Law
The Basic Law belongs to 1949. The historical reference for 27 January is instead Auschwitz’s liberation in 1945 and remembrance of Nazi victims.
German reunification
German reunification took place on 3 October 1990. It is a different event with a different commemorative or public-holiday date.
The remembrance day and a particular event’s date can differ.
Federal President Roman Herzog designated 27 January as the national remembrance day in 1996. He delivered the first related Bundestag address on 19 January 1996. Later parliamentary commemorations have not always taken place on 27 January itself either.
The name identifies a day of public remembrance. It says nothing about a present-day individual’s personal history or origins. Specific biographies require verified sources; a general illustration cannot replace them.
Remembrance since 1996 · German Bundestag ↗27 January: Auschwitz liberation in 1945, remembrance of Nazi victims.
Connect the day and month with the event and those commemorated. This clearly distinguishes 27 January from 3 October.
Three words for this question
- der Gedenktagday of remembrance
- A day of public remembrance for people or historical events.
- die Überlebendensurvivors
- People who survived life-threatening persecution or circumstances.
- entrechtento deprive of rights
- To take away people’s rights or exclude them from exercising those rights.
