What discovery did Allied soldiers make once they enter German territory toward the end of the war

Question

A All Nerman were rounded up and sent to Livin camps, regardless of nationality or race
B More than 6 million Jews had been tortured and murdered in death camps
C The Germans had all unusual land in the surrounding areas making the area unusable
D The holocaust was the Nazis for the war

Answer 1

B More than 6 million Jews had been tortured and murdered in death camps