It was a kind of social protest - people did not want to be discriminated because of their race or sex. This event was a precedence - nobody thought that something like this protest could occur at that time. Rosa Parks did something that made people think about tolerance and also made other people join her protest in different places.
Your answer would be:
C.It ended slavery, but it failed to guarantee the right to vote for African American men.
~<em>Luis~</em>
