The end of the "Reconstruction Era" is represented by which number on the timeline? A) 2 B) 3 C) 4 D) 5

The answer is "B) 3".
The Union triumph in the Civil War in 1865 may have given about 4 million slaves their freedom, yet the way toward revamping the South amid the Reconstruction time frame (1865-1877) presented another arrangement of critical difficulties.
In 1877, Hayes pulled back the last elected troops from the south, and the knife upheld Republican governments crumbled, accordingly finishing Reconstruction.