Which theory (classical theories, social contract, Marxism, and Utilitarianism) of social justice presented in chapter 10

Which theory (classical theories, social contract, Marxism, and Utilitarianism) of social justice presented in chapter 10 most closely matches our current system in the United States? The theories are classical theories, social contract, Marxism, and Utilitarianism, Explain how this theory is like our current system and how it is different?.