One major difference between how the weimar republic and the nazi regime pursued eugenics is that
a.
the weimar republic refused to pursue a policy of sterilization
b.
the nazi government pursued a policy of voluntary sterilization
c.
the nazi government pursued a policy of mandatory sterilization
d.
the weimar republic pursued a policy of mandatory sterilization

The correct answer is - C. the Nazi government pursued a policy of mandatory sterilization.

The Nazi government made a plan to make the country stronger on a genetic level, and they decided to enforce sterilization for the individuals that had genetic diseases/sicknesses. With this move, they thought that they will be able to eliminate the sick individuals in the future, thus having only strong and healthy population which will be of great benefit for the country.