Final answer:
To manage change during the merger, HR should consult with leaders to identify cultural and procedural gaps as the vital initial step, which paves the way for effective integration and transition planning.
Step-by-step explanation:
The first thing HR should do to help manage change in the organization is C. Consult with the organization's leaders to identify potential gaps in culture and processes. This step is crucial for understanding differences in the existing workplace cultures and practices between the merging companies. Addressing these gaps early is key to developing a change management plan that is more likely to be effective and minimize resistance.
Once the potential gaps are identified, HR can strategize on integrating the different cultures and work/life balance approaches, thus preparing a smooth transition for employees. Communicating plans to all employees and measuring the effectiveness of these changes come subsequently after careful planning and consultation.