The correct answer is A. It reinforces the idea that without equality in the US, the idea of a free society is a joke
Explanation:
The repetition of a word or phrase is a common device used in writing and speeches to reinforce a point by making it clearer or making the audience remember it. In the excerpt presented the speaker or author first explains he is there for the "enfranchisement of the black man" which means the speaker is fighting to make government and society give rights to the Afro-American population and then the author uses the phrase "without this" to support the idea that without the rights for the black population there is not a real enfranchisement or "liberty is a mockery" as the speaker considers slavery had ended but there are other ways in which society has vulnerate the freedom of this population. Considering this, the speaker mainly uses the phrase "without this" to "reinforce the idea that without equality in the US", which is represented by the lack of rights for the black population "the idea of a free society is a joke" because the speaker mentions society restrains the freedom and liberty of black men, even when slavery has finished.