The correct option is: c. racist attitudes continued in the North and South.
The approval of the 13th, 14th and 15th Amendments is the constitutional legacy of Reconstruction. These reconstruction amendments established the rights that led to Supreme Court rulings in the mid-twentieth century that ended school segregation. A "Second Reconstruction," initiated by the Civil Rights Movement, led to civil rights laws in 1964 and 1965 that ended segregation and reopened the ballot boxes to African-Americans.