The development of georgia's railroad system and the introduction of the cotton gin were similar in that

a)
each led to an decrease in the importation of slaves after 1808.

b)
each was an effect of increased industrialization in the "deep south."

c)
each was a major cause of the sectional conflict that resulted in georgia's secession in 1861.

d)
each was a major factor in the economic prosperity that characterized the antebellum period in georgia's history.