Which Belief Was Held by Eugenicists

Which belief was held by eugenicists?

A) Scientific research has proven that peoples from all racial and ethnic groups are equal in every respect.
B) Society has an obligation to prevent the reproduction of people deemed to be mentally defective and of those who are criminally inclined.
C) Aside from reproductive differences necessary for continuation of the species, differences between males and females are caused by culture and society.
D) The cure for all human diseases may be found in the plant world.