Which of the following techniques should an internal auditor use in order to conduct an...

The most effective technique for an internal auditor during interviews is to appear confident but not arrogant, as per option D. This approach helps maintain professionalism and facilitates open communication, which is crucial for gathering accurate information. This technique aligns with the IIA's guidelines on effective communication and professionalism during audit engagements. The other options could potentially lead to misunderstandings or might not create an environment conducive to honest and clear communication.

IIA Practice Advisory on Interviewing Techniques