Which of the following is a key responsibility of a project manager in a construction project?

A project manager in a construction project plays a crucial role in ensuring the successful completion of the project. One key responsibility of a project manager is project scheduling, which involves developing a timeline for project tasks and ensuring that milestones are met within the set deadlines. This is essential for keeping the project on track, managing resources efficiently, and aligning the efforts of various stakeholders.

Supplier negotiation is another important aspect of a project manager's duties. This involves negotiating contracts with suppliers and subcontractors to secure the necessary materials and services required for the project. Effective negotiation can lead to cost savings and better terms, which ultimately impact the project’s overall success.

Client interaction is also a vital responsibility. The project manager serves as a primary point of contact for the client, ensuring that their needs and expectations are met throughout the project's lifecycle. This involves regular communication, updates on project progress, and addressing any concerns the client may have.

Given that all of these responsibilities—project scheduling, supplier negotiation, and client interaction—are integral to the project manager's role, this combination justifies the selection of all of the above as the correct answer. Each responsibility contributes to successfully managing the project and satisfying both the client's expectations and project objectives.