In vertebrates, what joins the brain to the rest of the body?
a. spinal cord
b. medulla oblongata
c. peripheral nervous system
d. vertebral column

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate