Which sentence from the article BEST represents one of the article's main ideas?
A
For more than 380 days, African-Americans in Montgomery walked to work and were threatened and harassed.
B
King spoke about his belief that someday all men could treat each other like brothers, regardless of race.
C
In 1964, the Civil Rights Act outlawing discrimination in public places was passed.
D
King changed how African-Americans were treated in America.
D
King changed how African-Americans were treated in America.