In each of the following questions, a highlighted word is given followed by three sentences. Choose the sentence(s) in which the word is used correctly. WORD: Impugned The credibility of the witness was impugned during cross-examination, raising serious doubts about the authenticity of his testimony. The scientist impugned the results by strengthening them with additional empirical evidence. His integrity was impugned after allegations of financial misconduct surfaced in the investigation.