Which of the following actions would best help the internal audit activity promote continuous improvement...

To promote continuous improvement in control effectiveness, it is crucial that the internal audit activity evaluates whether management is effectively measuring and monitoring the costs and benefits of controls. This ensures that controls are not only designed appropriately but are also operating efficiently and providing the intended value to the organization. This proactive evaluation encourages continual refinement and adjustment of controls based on their effectiveness and efficiency.

IIA guidance on assessing and improving control effectiveness.