Who was responsible for the Wannsee Conference?

The correct choice is Reinhard Heydrich, who played a central role in organizing the Wannsee Conference held on January 20, 1942. This conference was convened to discuss and coordinate the implementation of what the Nazis called the "Final Solution" to the Jewish question, which entailed the systematic extermination of the Jewish population in Europe. Heydrich, as the head of the Reich Security Main Office, was tasked with overseeing this horrific plan and was known for his efficiency and ruthlessness.

Adolf Hitler, while ultimately responsible for the policies of genocide, did not personally oversee the meeting, making a direct association to him less accurate in this context. Heinrich Himmler, who was the leader of the SS and involved in the broader scope of the Holocaust, was not the primary organizer of the conference. Similarly, Joseph Goebbels, as Minister of Propaganda, focused on the media side of Nazi policies and was not directly involved in the planning aspects of the conference itself. Hence, Reinhard Heydrich is recognized as the key figure responsible for the assembly and execution of the discussions that took place during the Wannsee Conference.