Answer:
b. unstable political, social, and economic environments
Step-by-step explanation:
Eugenics is selection of desired heritable attributes so as to improve who and what is to come, commonly in reference to people.
Social Darwinism, the mainstream hypothesis in the late nineteenth century that life for people in the public eye was governed by "survival of the fittest," helped advance selective breeding into a genuine logical examination in the mid 1900s. By World War I numerous logical experts and political pioneers upheld selective breeding. Be that as it may, it eventually flopped as a science during the 1930s and '40s, when the suppositions of eugenicists turned out to be vigorously reprimanded and the Nazis utilized selective breeding to help the extermination of whole races.