Question

systematic murder of european jews and other \undesirable\ members of nazi society during the second world war.
holocaust
armenian genocide

Explanation:

The description refers to the mass, state-sponsored killing of European Jews and other groups targeted by Nazi Germany during World War II, which is the definition of the Holocaust. The Armenian Genocide occurred during World War I, perpetrated by the Ottoman Empire against Armenian civilians, so it does not match the given context.

Answer:

Holocaust