Brief introduction and Democratic party paragraph

The modern Democratic Party emphasizes egalitarianism, social equality, protecting the environment, and strengthening the social safety net through liberalism. They support voting rights and minority rights, including LGBT rights, multiculturalism, and religious secularism.Gallup. As of May 2020, Gallup polling found that 31% of Americans identified as Democrats, 25% identified as Republican, and 40% as Independent.

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.