Which of the following scenarios would most likely impair the independence of an internal audit...

Independence is a fundamental principle for internal auditing, ensuring that internal auditors are free from conditions that threaten their ability to carry out their responsibilities in an unbiased manner. Scenario B presents a clear impairment to independence because management's reduction of the internal audit budget, leading to the removal of all IT-related engagements from the audit plan, could limit the internal audit activity's ability to objectively assess areas critical to the organization’s risk profile. This type of management interference compromises the scope and depth of internal audit activities, impacting their ability to provide an unbiased assurance.

IIA Standard 1100: Independence and Objectivity

IIA Standard 1110: Organizational Independence