How does the section "Ugly Side Of U.S. History" support the CON author's argument?
A
by illustrating that no one understands why America still celebrates Columbus Day anyway
B
by providing evidence that America a has been a welcoming place for millions of immigrants
C
by highlighting the discrimination that Italian-Americans and Catholics faced because of Columbus Day
D
by emphasizing the idea that the day should focus on teaching the good and bad parts of American history