Answer:
Option: D. restoring the South's devalued currency
Step-by-step explanation:
In 1860, the Southern states were destroyed in the Civil War, to restore the country, Reconstruction was announced by the President of America to rebuild the South. The economic challenges the North faced, were in restoring the currency in the South after the war. Before the war, the South had its currency known as the Confederate States dollar (Greyback), which got devalued as the South started losing the war.