Which statement best describes a central principle of "social" Darwinism?

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Social Darwinism is the application of Darwin's theory of natural selection and survival of the fittest to human society. The central principle is that social divisions and hierarchies are a result of a competitive struggle for life, where the strongest and most capable rise to the top and the weakest fall to the bottom. This idea was used to justify the belief in the inherent superiority of certain races, classes, and individuals, and to argue against efforts to promote social equality and reform.

Which Statement Best Describes a Central Principle of "Social" Darwinism