Question

the enlightenment thinker baron de montesquieu came up with the idea of
the natural rights of all people.
using a revolution to obtain citizens rights.
the separation of the governments powers.
a social contract between government and people.

Explanation:

Baron de Montesquieu is well - known for his theory of the separation of government powers (legislative, executive, and judicial) to prevent the abuse of power. The idea of natural rights is more associated with John Locke, the idea of using revolution for citizens' rights is related to Rousseau in some aspects, and the social - contract theory has different proponents like Hobbes, Locke, and Rousseau.

Answer:

the separation of the government's powers.