Many educated Europeans at the turn of the twentieth century believed in a set of ideas called eugenics, which argued that A Humans could produce “superior” people through selective breeding and that it was their national duty to prevent the disabled and other “inferior” degenerates from reproducing B Astrology, metaphysics, and spirit forces could be scientifically proven through psychical research and Eastern philosophies C The invisible hand of the market was the only guiding force in the social and political order D A universal language known as Esperanto should be taught to all children as a means of creating a global, unified culture.