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Among the options given, the one what adds a participial phrase to the sentence is:
2. Frightened by a loud noise, the cat froze in place with its back arched.
- A participial phrase is comprised of a participle (present or past) and its complement, which can be nouns, pronouns, or even phrases.
- Participial phrases function as an adjective in the sentence, modifying a noun.
- Among the options given, number 2 has a participial phrase.
- The past participle being used is "frightened". "By a loud noise" is the complement.
- The noun being modified by the phrase is "cat".
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