The object of the preposition is over.
Sal learn from their experiences in this novel?
B.)everyone
C.)a noun
They always say that juvenile delinquency is a problem. C. a noun
A noun is a phrase that refers to a factor (book), someone (Betty Crocker), an animal (cat), an area (Omaha), a fine (softness), an idea (justice), or a motion (yodeling). it's usually an unmarried phrase, but no longer always: cake, footwear, faculty bus, and time and a half are all nouns.
A noun may be used as the difficulty of a sentence, or in every other ability as an item:
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B. Scallops taste better than shrimp, in, my opinion.
C. It won't rain, I hope for today's game.
D. At any rate it's better that we stayed home.