What was the focus on the national association for the advancement of colored people (naacp) during the 1920s and 1930s

The National Association for the Advancement of Colored People (NAACP) is one of the oldest and most influential civil rights institutions in the United States. It was founded on February 12, 1909 to fight for the rights of African Americans.

The NAACP fought on two fronts: in education and in judicial matters, such as the lawsuits against the Jim Crow Laws, which deprived blacks of civil rights. In 1915, thanks to the NAACP, the "grandfather's clause" was overturned by the United States Supreme Court. In 1954, the NAACP was already the largest civil rights organization in the world, at that time with half a million members.

can someone me with this question:  

1) the end of the conflict between the north and the south didn’t just mark the end of a war; it marked the end of an entire way of life.” which statement best describes what this statement means?  

a) the southerners were no longer free and were controlled by the northern states.

b) the industrial economy in the north was not sustainable.

c) slavery became illegal, which changed completely the south’s labor force and the agricultural economy was destroyed.

d) the states decided to relinquish their independence and return to britain’s rule.    

the south did not want the federal laws to overrule the state laws.