It is incorrect to have a preposition dangling at the end of a sentence. In fact, the preposition "of" is unnecessary in this sentence. "He heard the strangest rumors about the celebrity" is the best answer because it conveys the same idea in the most clear and concise manner.

This sentence contains a dangling preposition. Prepositions should never be at the end of a sentence. The correct choice is, "He forgot to whom he should give the message." Even though people do not speak like this in everyday English, "to whom" is the correct phrasing (Note: the pronoun should be "whom" because it is the object of the preposition "to.")

This sentence contains a dangling preposition. Prepositions should never end a sentence in English, so the sentence must be reworked in order to remove the mistake. Simply omitting the "to" at the end is not sufficient, however, since the sentence will not make sense once that is done. The correct choice is, "Sandra felt she could not talk to anyone" because it is the closest to the meaning of the original sentence and fixes the error.

This sentence contains a dangling preposition. A preposition should never end a sentence in English. "about his new position, but he did not know to whom he should talk" is the correct choice, as it fixes this issue. The other choices contain punctuation errors (Note: a comma should be used before "but" because it is joining two independent clauses) or change the action to passive voice unnecessarily.

This sentence contains a dangling preposition. You should never end a sentence with a preposition in standard English. Additionally, "yet" cannot come at the end of the sentence either, since it is a conjunction. The only choice that fixes this issue is, "Though Harun has broken many records, he has not yet broken the record he wants to break."

This sentence contains a dangling preposition. Prepositions should never end a sentence in standard English. The only sentence which fixes this issue and makes sense is "monitored to which clients the employees talked."

This sentence contains a dangling preposition. The only choice that corrects this error properly is, "the message did not reveal who sent it." Note that the choice that states "from whom it was sent" is in the passive voice (correct choices will always be in the active voice), so it cannot be the correct answer.

This sentence contains a dangling preposition. Prepositions should never appear at the end of a sentence. Instead of saying "which department he should deliver his work to," it should be "to which department he should deliver his work." The correct choice is, "Lamar was unsure to which department he should deliver his work."

This sentence contains a dangling preposition; a preposition should never end a clause in standard English. In actuality, there is no need for the word "of" whatsoever, and all that is needed is to omit it. The correct choice is, "what the next invention would be."

This sentence contains a dangling preposition. Prepositions should never end a clause. The sentence needs to be reworded. The correct choice is "She wondered who was in the painting" as the other choices either have the dangling preposition or pronoun errors.