Answer: [B]: "flower" .
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<span>a. After
A preposition is a word that comes before a noun that tells the reader where one noun is in relation to another noun. In the sentence, after tells when she ended the dinner. In this case "After a disastrous dinner" is the entire prepositional phrase. Sometimes the word to is considered a preposition. However, in this case, it is part of the infinitive form of the verb end.
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The gerund phrase would be "is foolish" because it indicates what reckless driving is.
I honestly don't think there is anything positive about peer pressure, but maybe it could be positive if your peers are trying to make you do something good? Sorry, I'm not totally sure...