The 19th-century philosophy of social darwinism maintained thata. the government should have control over the means of production and the marketplace b. all social class distinctions in american society should be eliminated c. economic success comes to those who are the hardest working and most competentd. wealth and income should be more equally distributed

   Economic success comes to those who are the hardest working and most competent

Explanation: Social Darwinism theory referred to a theory taken from Darwin's theory of evolution, according to which only the most capable individuals survive and continue their own species. Thus, proponents of Social Darwinism argued that only the wealthiest, most valuable hardworking entrepreneurs should survive in the market, thus opposing social reforms.

the correct answer is:

a population changes in response to a change in the environment.

i don't know. if i were you, i would search it up online : d