The correct answer is B) Diderot.
The Enlightenment thinker that co-founded and edited the Encyclopédie was Diderot.
Denis Diderot (1713-1784) was a French writer and philosopher that edit the English Encyclopedia of Ephraim Chambers and translated from English into French. He also contributed with 35 volumes and the document was called"Encyclopedia or Reasoned Dictionary of Arts and Crafts." For this to happen, he collaborated with Montesquieu and Voltaire. So it is true that the Enlightenment thinker that co-founded and edited the Encyclopédie was Diderot.