Which series of events led to the liberation of victims of the Holocaust?

A. Allied forces led a successful military advance to reclaim France following the D-Day victory at normandy.
B. Allied forces encountered concentration and death camps as they took control of Europe after defeating Germany.
C. Allied officials negotiated the release of prisoners of war after concluding peace at the Potsdam Conference.
D. Allied leaders agreed to try Nazi officials for war crimes while negotiating armistice terms at Yalta.