Wilhelm I was the King of Prussia from 1861 until his death and also the first Emperor of the unified German Empire since 1871. Under his leadership as head of state, Prussia achieved the German Unification and consequently the establishment of the German Empire (modern Germany as we know it today, but with greater territory).
The south didn't grow crops very much, instead they grew cotton which made them rely on the North for crops and other materials. So the correct answer would be "B" since that seems like the most plausible answer.
