The answer is...
C)The social backround of the characters or author
Visual elements could be any sort of illustration or photographs or diagrams. These can all set the tone of the writing.
Well basically Malcolm X was a modern-day Julius Caesar since he was murdered by the same people who helped him get started as a spokesman and they were both thought to be leaders by others. A difference in them I guess would have to be that Julius Caesar was an ancient European ruler from noble roots while Malcolm X was an African-American ex-convict turned political and social leader.