The responsibility for inspecting portions of the Work already completed to determine that they are acceptable to receive subsequent work lies with the:

The responsibility for inspecting portions of the work already completed to ensure they are suitable for subsequent work lies with the contractor. This is because the contractor is ultimately accountable for the quality and integrity of the work performed on the project. The contractor must verify that all completed work meets the project's specifications and standards before allowing additional work to proceed.

The contractor's role includes diligent oversight of the construction process, ensuring that all aspects meet regulatory codes and construction plans. This part of construction management allows the contractor to maintain control over the project timeline and quality, and it helps prevent rework or complications later on.

The other options involve roles that, while critical in the construction process, do not carry the direct responsibility for inspection in this context. The architect/engineer may perform inspections and define the standards to be met but typically does not take on the responsibility for ensuring that completed work is ready for subsequent phases without the contractor's confirmation. Similarly, subcontractors are usually responsible for their own segments of the work, but they rely on the contractor to ensure prior work is acceptable before proceeding. Building inspectors, while vital for compliance with building codes and regulations, typically evaluate the work from a compliance viewpoint rather than from the perspective of project continuity.