Which statement is the most accurate? 

a) The South had some very substantial economic grievances against the North in the years immediately preceding the Civil War.

b) The South seceded from the Union when President Lincoln proclaimed that he was freeing the slaves.

c) Aside from slavery, Southern and Northern agriculture were very similar.

d) Most of the nation’s industries were relocated from the North and Midwest to the South in the years immediately following the Civil War.