A risk heat map is the best tool to enable senior management to compare the ratings of risk scenarios, as it provides a visual representation of the risk level and priority of each risk scenario, based on the combination of the likelihood and impact ratings, and the risk tolerance and appetite of the organization. Key risk indicators (KRIs), key performance indicators (KPIs), and control self-assessment (CSA) are not the best tools, as they are more related to the measurement, monitoring, or testing of the risk scenarios, respectively, rather than the comparison of the risk scenarios. References = CRISC Review Manual, 7th Edition, page 110.