The correct option is "Voltaire’s idea of natural law"
François-Marie Arouet (Paris, November 21, 1694-ibid., May 30, 1778), better known as Voltaire, was a French writer, historian, philosopher and lawyer, who belonged to Freemasonry and figures as one of the principal representatives of the Enlightenment, a period that emphasized the power of human reason, science and respect for humanity. In 1746 Voltaire was elected a member of the French Academy, in which he occupied the seat number 33.
Voltaire achieved celebrity thanks to his literary and above all philosophical writings. Voltaire sees no opposition between an alienating society and an oppressed individual, an idea defended by Jean-Jacques Rousseau, but believes in a universal and innate sense of justice, which has to be reflected in the laws of all societies. Life in common demands a convention, a "social pact" to preserve the interest of each one.