正解:C
The best way to resolve the concern where a control process has been implemented in response to a new regulatory requirement, but has significantly reduced productivity, is to escalate the issue to senior management. Senior management is the highest level of authority and responsibility in the organization, and they are responsible for setting the strategic direction, objectives, and risk appetite of the organization. Senior management should also oversee the risk management process, and ensure that the controls are aligned with the organization's goals and values. Escalating the issue to senior management can help to find a balance between complying with the regulatory requirement and maintaining the productivity of the organization. The other options are not as effective or desirable as escalating the issue to senior management, because they either ignore the problem, violate the regulation, or compromise the control.