In the given passage, the correct choice to correct a mistake in the underlined portion is 'C asking the candidate questions about his or her history.' The correct option is C.
The correct answer to the underlined portion in the passage is:
C asking the candidate questions about his or her history.
This option corrects the mistake of using the word 'there' instead of 'their.' The interviewers are asking the candidate questions about the candidate's own history, so the correct possessive pronoun to use is 'his or her.'