SAT I Writing Section Need Explanation

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<li> Off the coast of Maine lies Monhegan Island, an artists’ community with no modern conveniences, the only one of a kind in the area.</li>
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<p>The answer is the underlined part but I do not know why it is incorrect. Can someone give a specific explanation please?</p>

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<p>It really just doesn’t make sense. Changing it to “of its” would make it correct, I think.</p>