Hitler.
the question was what to do with them.
Anyone who was not Jewish - the full title was the 'final solution to the Jewish question'.
The Final Solution (of the Jewish question).
hittler
It was called the Final Solution [of the Jewish Question]. Please see related question.
It is generally called the Holocaust (with a capital H). Sometimes it is called by the Hebrew word Shoah. The Nazis themselves referred to it as the Final Solution [of the Jewish Question].
It refers to the Holocaust. 'The Final Solution to the Jewish question', it was the plan to murder the Jews of Europe.
The Final Solution( Of the Jewish Question)
Mass murder, the 'Final Solution' was to kill them, until then other outcomes were explored.
in this context they would normal talk about the final solution to the Jewish question, which was the extermination of the Jews.
Himmler was in charge of carrying out the Final Solution, but he did not initiate it.
The final solution refers to Hitler's "solution" to the Jewish question which involved killing millions of Jews.