Mj schleiden shifted the scientific community’s attention to cellular processes with a) attention to disapproving spontaneous generation. b) publication of ideas on cell generation. c) theories of cell division. d) claim that cells were the basic unit of plant matter

 His claim that cells were the basic unit of all plant matter.

Explanation:

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.