Answer:
B. over six million
Explanation:
Operation Reinhard camps was a systematic codename for the secret German plan headed by Reinhard Heydrich to massacre (exterminate) Polish Jews during the World War II i.e from October, 1941 to November, 1943 in German-occupied Poland.
The introduction of an extermination camp to execute the secret German plan of mass murder was considered to be the deadliest (lethal) period or phase of the Holocaust.
Under Operation Reinhard, the extermination camps were Sobibór, Treblinka, Bełżec, Chełmno, Auschwitz II and Majdanek.
In order to cover up the massacre (mass murder) of the Polish Jews, the Nazi army developed a secret plan termed the Sonderaktion 1005, also known as Aktion 1005 (exhumation action) so as to remove all the signs and traces.
In conclusion, over six million Jewish men, women, and children were killed during World War II.
