The correct options are
A Thousands of Jews were killed in gas chambers
B Jews were used as part of forced labour
D Jews were actively denied proper food and healthcare
After the outbreak of World War II, Hitler established concentration camps to torture and kill Jews.
Gas chambers were used to kill thousands of people at once using poisonous gas.
Jews were used as part of forced labour in the barracks, surrounded by electrified fences and watchtowers. Later, they were brutally murdered.
They were actively denied proper food, water, and healthcare in the concentration camps.
Around 6 million Jews in Europe were killed in the 'Final Solution' proclaimed by the Nazis. Gypsies, other minor communities, and the differently-abled were exterminated alongside Jews in these concentration camps.