C. the return to "classical" thought
The rational foundation of the Renaissance was its version of humanism, acquired from the notion of Roman Humanitas and the rediscovery of ancient Greek philosophy, such as that of Protagoras, who announced that "Man is the measure of all things." This new thought became evident in art, construction, governments, science, and history. Early examples were the expansion of prospect in oil painting and the recycled information on how to make ferroconcrete.