Which idea best expresses the philosophy of progressive reformers

malleability of human nature

Explanation: for medieval man human nature was described and explained the Bible. But medieval paradigm was progressively replaced ...in all areas of human life. This process started in Renaissance and Reformation and continued during Scientific and Industrial Revolution. The result was an idea that the humans are historically, socially, culturally conditioned creatures. This idea is at the base of fascism, communism, nazism as well. Utopianism is a part of European philosophical tradition idea that everything can  be made better, idea that the new is better than  the old. Social engineers, progressive reformers that human nature can be changed for better.  

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a was not the right answer