An allusion is a reference to a literary character from a well-known work (for example, Frankenstein, Sherlock Holmes, Biblical characters, etc.). This allows a writer to avoid having to explain all the finer points of his character, by simply pointing the reader to another well-known character. The answer is D.
True. this is going to show what the paragraph will be about
Well since the person is obviously having a hard time trying to put the puzzle together so I would say unpleasant