corroborate
avouch
verify
approve
Answer is Right!
Answer is Wrong!
The correct answer is A. corroborate.
To corroborate is to confirm or give support to a statement or story. In this case, the speaker is saying that they will not be able to use the person’s ability in court unless they can find someone else to confirm that the person is telling the truth.
The other options are not as accurate. To avouch is to declare or assert something to be true. To verify is to check or confirm the truth of something. To approve is to express agreement with or support for something.
In this case, the speaker is not simply asking for someone to agree with the person’s ability, but for someone to confirm that the person is telling the truth.