The correct answer is A) They destroyed the South’s morale and captured its capital, forcing the South to surrender.
The actions of Union generals Grant and Sherman affected the outcome of the Civil War in that they destroyed the South’s morale and captured its capital, forcing the South to surrender.
Confederate General Joseph E. Johnston surrendered to Union's General William E: Sherman at Bennet Place on April 26, 1865. General Robert E. Lee had surrendered at the Appotomax to General Ulysses S. Grant, and with these Union's victories, the war was over. So yes, the actions of Union generals Grant and Sherman affected the outcome of the Civil War in that they destroyed the South’s morale and captured its capital, forcing the South to surrender.
The other options of the question were B) They respected Southerners’ property, helping the war to end peacefully. C) They rebuilt Southern cities that had been destroyed after the South surrendered. D)They lost so many soldiers that they had to stop fighting, forcing the Union to surrender.