The sentence containing an appositive phrase and a relative pronoun is<em> Tiny, a fierce people-watcher, is her cat that is new.</em>
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Explanation:
An appositive noun or noun phrase is a word or a group of words that follows another noun or noun phrase, providing additional information about it. Appositive phrases are often easily recognizable as they are framed by commas. For example: <em>John, Anna's son, is a good student</em>. <em>Anna's son</em> is an appositive phrase, providing information about<em> John</em>. It's the same in sentences C and D. In sentence C,<em> a Calico cat </em>is an appositive phrase added to <em>Tiny</em>, and in D the phrase <em>a fierce people-watcher </em>has the same function.
Relative pronouns connect relative clauses or phrases to a noun or pronoun. These clauses modify the nouns or pronouns, meaning that they provide additional information about them. The most common relative pronouns are <em>who, whom, whose, which, </em>and <em>that.</em> A relative pronoun<em> </em><em>that</em> is encountered in the sentence D in the phrase <em>cat that is new</em>. This pronoun connects information (<em>is new</em>) to the noun (<em>cat</em>). It may seem like there is a relative pronoun <em>who</em> in sentence C, but as there is no noun to connect the information to, the pronoun <em>who </em>isn't relative.
Learn more about clauses here: brainly.com/question/2416201
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