SAT Question aa5897b8: Text Structure And Purpose answer and explanation

English - Text Structure And Purpose - Function Of Specific Sentence
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In Jane Austen’s novel Mansfield Park, an almost imperceptible smile from potential suitor Henry Crawford causes the protagonist Fanny Price to blush; her embarrassment grows when she suspects that he is aware of it. This moment—in which Fanny not only infers Henry’s mental state through his gestures, but also infers that he is drawing inferences about her mental state—illustrates what literary scholar George Butte calls “deep intersubjectivity,” a technique for representing interactions between consciousnesses through which Austen’s novels derive much of their social and psychological drama.
90
Difficulty:Medium
Which choice best describes the function of the underlined sentence in the text as a whole?