Who were used as test subjects for the Nazi's new gas killing vans? A. Roma B. people with mental disabilities C. Jewish citizens D. Nazi officers

B. People with mental disabilities.

Explanation:

The gas-killing vans were gas chambers in vans that can be taken wherever required. Such vans were a mobile version of the killing chambers of the Holocaust extermination under Nazi Germany.

These vans were reequipped with chambers like the gas chambers in the concentration camps. And it was used to kill people by carbon monoxide poisoning. The test subjects of such chambers were the patients of mental disability, leading the way for a faster means of execution rather than transporting the victims to the stationary gas chambers.

Thus, the correct answer is option B.

for the 2 countries u can do china and america because america has a democratic government while china has a communist government.

a democracy is a government run by the people either by directly voting or indirectly by electing representatives. an oligarchy is a government run by a few or a small group of people. a democracy and oligarchy are similar because both in an oligarchy and an indirect democracy, a small group of induvial determine the laws for a large group of people they are different because in an oligarchy it is easier to control and they do not have to answer to a large number of people in the country, unlike a democracy where they do have to answer to a large number of people an county that is a democracy would be the united states. a country that is an oligarchy would be the china.