The answer is the antagonist, which is basically the enemy/rival. Ex: in Harry Potter, Voldemort is the main antagonist
The quotation is used as a comparison to how much they, African Americans, still struggle to get simple things such as getting a cup of coffee at a lunch counter or getting a newspaper at a local news stand , as if they were in a time before automobiles and buses , back when African Americans were enslaved and treated unfairly . It's using the metaphor as a way to show how little they've progressed through out the decades.
Answer:
a) Not been disseminated before unless noted otherwise.
Explanation:
The communication process between different languages, mostly if there are grammatical differences or different alphabetical systems, can cause problems. Ethical scholarship involves a writer-reader agreement in which readers take as given that the information is precise, complete and the author has not previously disseminated it, whether completely or not, thus depicting the author's self-elaborated work (he/she has not committed plagiarism).