The correct answer is: " It decreased morale and increased the number of deserters in the Confederate Army."
Sherman's March to the Sea started in November 1864 and was a military strategy that was put in practice during the American Civil War by the major general of the Union Army called William T. Sherman. His trops left Atlanta, just captured and ended up taking over the port of Savannah too. They manage to destroy infrastructures, industry and civilian properties, which disrupted the economy of the Confederates. This move helped to trigger the surrender of the Confederacy, that was totally broken afterwards.