Have no one to talk to, so who wants to talk

Literary criticism, critic and critique

Why did bramante’s plans for the st. peter’s basilica never come to fruition? a. he and the pope could not agree on the plans. b. the pope changed his mind several times. c. the pope died and political unrest followed. d. bramante died before he could act on the plans.

Which does the author mean by " nature had to kindle all the fires, for man by his own effort was unable to produce a spark