Final answer:
The Directory is the option related to an Enlightenment idea, as it was a post-Revolutionary government structure in France influenced by the movement's principles of reason and separation of powers.
Step-by-step explanation:
The Enlightenment was a philosophical movement that emerged in Europe during the 18th century. It emphasized the power of reason over tradition and introduced ideas like liberty, progress, tolerance, and the separation of church and state. These ideas were revolutionary at the time and greatly influenced the structures of government and societies across the globe.
Of the options provided, The Directory is directly related to an idea from the Enlightenment. The Directory was an executive council established in France after the decline of the Reign of Terror, and it reflected Enlightenment ideals by moving away from the previous absolutist rule.