Final answer:
A Risk audit is the most fitting process for reviewing the effectiveness of risk responses and analyzing the root causes of risks as part of risk management.
Step-by-step explanation:
The most appropriate process for reviewing the effectiveness of risk responses in dealing with the identified risks and their root causes is a Risk audit. A Risk audit is a thorough examination and evaluation of a project's risk management processes and the effectiveness of the risk responses. This process goes beyond simply reviewing the risks and their responses; it involves a deeper root cause analysis which targets not just the symptoms but the underlying reasons for the risks. It's an essential part of the risk monitoring and controlling process.