Which of the following is responsible for assuring the quality of the deliverables in a project?

The Quality Assurance (QA) manager is responsible for ensuring that defined quality processes and standards are adhered to, not for ultimate accountability of the deliverables themselves.

The Quality Control (QC) manager inspects and tests completed deliverables to identify defects but is not the role that holds overarching accountability for deliverable quality.

Stakeholders are consumers and influencers of project outcomes who define requirements and approve results, but they are not responsible for managing or assuring quality of the deliverables.

According to the PMI PMBOK Guide, the project manager is ultimately responsible for the overall success of the project, which explicitly includes accountability for the quality of its deliverables. While QA managers ensure quality processes are followed and QC managers inspect deliverables for defects, the project manager delegates these functions but retains final accountability. No other role has the overarching authority and responsibility to ensure deliverable quality across the entire project lifecycle.