Help please, What are some of the hidden messages in spirituals?

How did brunelleschi solve his problem with the dome of the florence cathedral? a. he created an outer support shell. b. he created many layers of support within the dome. c. he created external supports for the dome. d. all of the above

Name the note a) a b) e c) g d) d

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