The correct answer is B) Segregation continued in the north and south.
The statement about race relations in the North and South after reconstruction is true is "segregation continued in the north and south.
Although answers A) and C) are exactly the same, one should have bee "Blacks and whites live together in the north." This should be considered a correct answer.
However, race relations in the North and South after Reconstruction remained tense. In the North, segregated was maintained by habit, not by law.
After the Civil War, the United States government had officially ended slavery in the country. President Abraham Lincoln tried to reintegrate the Southern States to the Union during the Reconstruction period, but his anxiety to do it quickly allowed the Southern States leeway to do Reconstruction in their own terms. In the North, where many people had supported abolitionism before the Civil War, they were more receptive to integrate black people in society, although the process was not as easy as in theory it should have happened.
