The sentence containing an appositive phrase and a relative pronoun is Tiny, a fierce people-watcher, is her cat that is new.
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: John, Anna's son, is a good student. Anna's son is an appositive phrase, providing information about John. It's the same in sentences C and D. In sentence C, a Calico cat is an appositive phrase added to Tiny, and in D the phrase a fierce people-watcher 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 who, whom, whose, which, and that. A relative pronoun that is encountered in the sentence D in the phrase cat that is new. This pronoun connects information (is new) to the noun (cat). It may seem like there is a relative pronoun who in sentence C, but as there is no noun to connect the information to, the pronoun who isn't relative.
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