How did the union capture of atlanta president lincoln win reelection in 1864?

select the best answer from the choices provided.

a. it caused the south to surrender to the north, finally ending the civil war.

b. it improved the confidence of many in the union, strengthening their support for lincoln and the war.

c. it was a victory for general mcclellan, lincoln's main opponent.

d. it weakened thousands of lincoln’s copperhead opponents, who lived in atlanta.