TSA CBT Practice Test 2026 – The Complete All-in-One Guide for Exam Success!

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.