Following the civil war, south carolina's railroads expanded, improving the movement of people and goods. what was one effect of the growth of railroads on south carolina farmers?

a) many farmers left their farms to become railroad construction workers.
b) farmers stopped planting certain crops, like tobacco, and only grew cotton.
c) farmers could ship their crops greater distances with refrigerated train cars.
d) most farmers sold their farmland to railroad companies to use for construction.