Eloquence is "Fluent or persuasive speaking or writing"
So it's A) Because it expresses him/her self!
Hope this help :)
The main purpose of Luther's speech was to persuade the audience to work towards ending the racial discrimination. Additionally, it inspired and brought hope to the people that one day discrimination can be abolished.
The correct answer would be B) No because there is only one negative in the sentence and that would be ''aren't'' since that means are not, so since that's only one, and not two, its not a double.