Publication of Denis Diderot's Encyclopédie Was Difficult Because

Publication of Denis Diderot's Encyclopédie was difficult because:

A) It was banned as subversive by the Catholic Church and the French monarchy.
B) Most of the articles had to be translated into English in order to widen its market.
C) All of its four volumes appeared in one set in 1772, forcing printers to work overtime.
D) His collaborator, Jean le Rond d'Alembert, died in the midst of the project.