为自己加油

Choose the closest paraphrased version after the following sentence or the italicized part.

They did not seem to realize what the poison of Nazism was doing to them. ( )

A.
They were not mentally prepared for the mass killing by the Nazis.
B.
They had no idea that the Nazis were producing chemical weapons.
C.
They were unaware of the harm that Nazism was doing to their minds.
D.
They did not understand the dangerous situation brought about by Nazis.