Which of the following types of policies best helps promote objectivity in the internal audit...

Promoting objectivity in internal auditing involves ensuring that auditors avoid conflicts of interest and maintain independence in both fact and appearance. Policies that clearly define and give examples of inappropriate business relationships help auditors understand and avoid situations that could impair their objectivity.

IIA Standard 1120 (Individual Objectivity) emphasizes the importance of internal auditors maintaining an unbiased mindset and avoiding conflicts of interest.