Answer is C :

When additional requirements are discovered early in a project that has a fixed budget and timeline, the consultant's first step should be to document the gap in requirements and discuss the potential impacts on schedule and budget with the project team. This approach ensures that all stakeholders are aware of the changes and can collaboratively decide on the best course of action.​

Key Considerations:

Scope Management:Clearly defining and managing project scope is crucial. Any changes to the scope should be carefully evaluated for their impact on time and cost.​

Stakeholder Communication:Engaging with stakeholders to discuss the implications of additional requirements helps in setting realistic expectations and making informed decisions.​

Change Control Process:Before implementing any changes, it's essential to follow a formal change control process, which includes documenting the change, assessing its impact, and obtaining necessary approvals.​

By taking these steps, the consultant ensures that the project remains aligned with its objectives and constraints, and any deviations are managed in a controlled and transparent manner.​...

C seem more plausible