In 'wire-rimmed, is this a hyphen or dash? what is its function?

2pointsread this excerpt from the beginning of nikolai gogol's "the nose": on the 25th march, 18-, a very strange occurrence tookplace in st petersburg.which option best explains why gogol chose to begin his story in this way? oa. to let readers know that the story that follows is nonfictionb. to explain that information in the story is factual and correctooc. to immediately establish a straightforward and matter-of-facttoneod. to allow readers to better imagine what st. petersburg looks likesubmit