Concept:Holocaust Memorial Day is observed on January 27 each year, marking the liberation of Auschwitz-Birkenau.
Explanation:The United Nations General Assembly declared January 27 as International Holocaust Remembrance Day in 2005.
This date was chosen because on January 27, 1945, Soviet forces liberated the Auschwitz-Birkenau concentration camp.
The day honors the six million Jews and millions of other victims (Roma, disabled, political prisoners) killed in the Holocaust.
While many countries have their own national remembrance days, January 27 is the globally recognized Holocaust Memorial Day.
Answer:Option B – January 27.