Final answer:
The appositive phrases in the given sentences are identified, and examples are provided. The sentence with an incorrectly punctuated appositive is chosen, and the false statement about an appositive is identified.
Step-by-step explanation:
The appositive in the sentence 'Mrs. Guerrero, the president of the historical society, is retiring next summer' is 'the president of the historical society', which renames 'Mrs. Guerrero'.
In the sentence 'My best friend Justin was responsible for the birthday party', the appositive is 'Justin', which renames 'my best friend'.
In the sentence 'Stephanie, the youth police board president, wants to volunteer at the food bank', the appositive is 'the youth police board president', which renames 'Stephanie'.
The sentence with an incorrectly punctuated appositive or appositive phrase is 'Grandpa has many recordings of the music of Wolfgang Amadeus Mozart, his favorite composer.'
The statement that is not true about an appositive is 'It is a prepositional phrase'.