1. Identification of Error: Misplaced Modifier (Dangling Participle) and Passive Voice. 2. Grammatical Rule: An introductory participial phrase or adverbial clause must logically modify the subject of the main clause that immediately follows it. In the original sentence, "After tirelessly searching for evidence" illogically modifies "the hidden truth," as the truth cannot search. The sentence also uses the less concise passive voice. 3. Option Elimination: A. Incorrect — Retains the dangling modifier as "the hidden truth" cannot perform the action of "searching for evidence." It also employs passive voice unnecessarily. B. Incorrect — Introduces a Subject-Verb Agreement error by using "were" with the singular subject "truth," and fails to correct the dangling modifier. C. Correct — Restructures the clause to make "the investigative journalists" the grammatical subject, which logically performs the action of "searching for evidence," thereby correcting the dangling modifier. It also improves conciseness and clarity by using active voice. D. Incorrect — Fails to correct the dangling modifier, as "the uncovering" cannot perform the action of "searching," and introduces a wordy and awkward passive construction.