What Advantage Did the North Have Over the South at the Beginning

What advantage did the North have over the South at the beginning of the war?

A) A large federal reserve to tap into for war costs.
B) A stronger sense of mission in the desire to end slavery.
C) Massive industrial capacity and most of the nation's railroad track.
D) A large population of free blacks who enlisted to fight alongside whites.
E) A short distance within its defensive arc for moving troops and supplies.