What makes a novel realistic as opposed to romantic has not to do exclusively with its subject matter, but also with the approach taken to the subject matter. Although the basic plot – that two girls from the lower rungs of the gentry would end up happily marrying rich men – is not entirely probable, Jane Austin eschews the wild imaginative settings and events of the Gothic novel, the preceded her or of the Brontë sisters. Her narration is humourous and matter-of-fact and the character traits her heroes and heroines display are those of normal young men and women of the period. They aren’t geniuses or described as supernaturally beautiful. Elizabeth is clever but not a genius who speaks eight languages and plays the piano as well as a professional (as Mrs. Radcliffe’s heroines often do) and Jane is nice but not a saint.
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Thank you very much, your answer was impressive and cleared my doubts. The above question was not particularly the assignment question, so I won't use it as my answer. If I do use it for any other purpose I will be sure to cite it as you indicated. :)