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Which of the following choices includes only prepositions?

  1. Before, at, and yet

  2. By, for, and on

  3. And, but, and or

  4. Up, with, and nor

The correct answer is: By, for, and on

Prepositions are words that typically show the relationship between a noun or pronoun and other words in a sentence. In this question, the correct answer is option B: By, for, and on. These three words are all examples of prepositions. "By" shows a relationship of proximity or agency, "for" shows a relationship of purpose or destination, and "on" shows a relationship of position or location. Therefore, option B is the correct choice as it consists only of prepositions. The other options are not correct: - Option A: Before and at are prepositions, but "yet" is not a preposition. - Option C: And, but, and or are coordinating conjunctions, not prepositions. - Option D: Up and with could be prepositions, but "nor" is a coordinating conjunction.