According to the CRISC Review Manual, a root cause analysis is a technique that identifies the underlying causes of an event or a problem. It helps to determine the most effective actions to prevent or mitigate the recurrence of the event or problem. A root cause analysis is the best approach for the risk practitioner to take in this scenario, because it will help to understand why the number of emergency changes has increased substantially and what can be done to address the issue. The other options are not the best approaches, because they do not address the underlying causes of the problem. Temporarily suspending emergency changes may disrupt the business operations and create more risks. Documenting the control deficiency in the risk register is a passive action that does not resolve the problem. Continuing monitoring change management metrics is an ongoing activity that does not provide any insight into the problem. References = CRISC Review Manual, 7th Edition, Chapter 3, Section 3.2.4, page 130.