The phrase that is present in the sentence "Frustrated with the delays, Erin tried to break her dog out of quarantine" is an appositive phrase.
What is an appositive phrase?
An appositive phrase is a phrase that add additional information to the sentence. Just like in this sentence, frustrated with the delays, add information for the sentence why Erin break her dog out of quarantine.
Thus, the correct option is B, appositive phrase.
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