Question

When the Nazi death camps were liberated, people around the world were most shocked by
the existence of the camps.
the size and scale of the camps.
the secrecy of the camps.
the locations of the camps.

Answer 1

the size and scale of the camps.

Although rumors of Nazi atrocities circulated during the war, liberating soldiers and worldwide audiences were stunned by the industrialized, systematic mass murder — the huge numbers of victims, the crematoria, piles of corpses, and the extensive infrastructure built to carry out genocide.