I believe that it is B however, I'm not positive.
The answer you’re looking for I believe, is Commerce.
Answer: That whenever any Form of Government becomes destructive of these ends, it is the right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles, and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.
2,709,918 American Troops
After the Civil War, 4 million former slaves were looking for social equality and economic opportunity. It wasn't clear initially whether they would enjoy full-fledged citizenship or would be subjugated by the white population.
In the 1860s, it was the Republican Party in Washington — the home of former abolitionists — that sought to grant legal rights and social equality to African-Americans in the South. The Republicans — then dubbed radical Republicans — managed to enact a series of constitutional amendments and reconstruction acts granting legal equality to former slaves — and giving them access to federal courts if their rights were violated.
The 13th Amendment, which was ratified in 1865, abolished slavery. Three years later, the 14th Amendment provided blacks with citizenship and equal protection under the law. And in 1870, the 15th Amendment gave black American males the right to vote.
Five years later, Congress passed the Civil Rights Act of 1875, a groundbreaking federal law proposed by Republican Sen. Charles Sumner of Massachusetts, which guaranteed that everyone in the United States was "entitled to the full and equal enjoyment" of public accommodations and facilities regardless of race or skin color.
