The contradictions challenge his audience's assumptions about him.
Option (c);
Step-by-step explanation:
- Fourth of July is celebrated as American Independence Day and Frederick Douglass was the black American leader was invited to deliver a speech on this day.
- But he refused to celebrate on this day and said that he will mourn until all the slaves are liberated.
- Thus, one effect of Douglass's use of contradictions in his speech is that contradictions challenge the audience's assumptions about him.
- He delivered his speech on the fifth of July and he said that there are several black slaves in the country.
- Only when all the slaves will be liberated, he will celebrate.