Which of the following is MOST important to include in an information security status report...

According to the CISM Review Manual, key risk indicators (KRIs) are the most important information to include in an information security status report to senior management, as they provide a measure of the current level of risk exposure and the effectiveness of the risk management activities. KRIs also help to identify trends, patterns and emerging risks that may require management attention or action.

References = CISM Review Manual, 27th Edition, Chapter 4, Section 4.3.2, page 209