The correct answer is B. Organize a stakeholder workshop to discuss the effectiveness of the new security measures.

The response has already been implemented and tested, but executives are concerned about its operational impact. This is now both a stakeholder engagement and risk monitoring issue. A workshop is the best option because it allows the risk manager to present test results, gather executive concerns, discuss trade-offs between security and operational efficiency, and determine whether further adjustments are needed.

Why the other options are incorrect:

A. Facilitate a risk identification session on security measures with the company executives. This is too narrow and steps backward. The issue is not only identification, but discussion of effectiveness and operational impact after implementation.

C. Implement additional security measures to address the concerns expressed by the executives. Adding controls immediately without analysis may worsen the operational burden.

D. Acknowledge the concerns and focus on monitoring the effectiveness of the new security measures. Monitoring is important, but this response is too passive given active executive concern. Engagement and discussion are needed.

Reference-aligned basis:

This answer is consistent with risk and stakeholder management practice that implemented responses should be reviewed with affected stakeholders to confirm effectiveness and unintended impacts.