What must the Contractor do before starting each portion of the Work?

The correct choice emphasizes the importance of the Contractor carefully studying and comparing the various Contract Documents before commencing each portion of the Work. This is essential because it ensures that the Contractor has a comprehensive understanding of the project's requirements, specifications, and any drawings provided. By thoroughly reviewing these documents, the Contractor can identify any discrepancies, conflicts, or essential details that may affect the execution of the work. This step is crucial in preventing misunderstandings and ensuring that the construction proceeds smoothly and conforms to the intended design and specifications.

Understanding the Contract Documents helps set the stage for effective project management, coordination among various trades, and adherence to timelines and budgets. It lays the groundwork for informed decision-making and effective communication with all stakeholders involved in the project.