A tool or technique in Perform Quality Control that a project manager would use is:

According to the PMBOK® Guide, specifically within the Control Quality process (formerly known as Perform Quality Control), Inspection is a primary tool and technique used to determine if work and deliverables conform to requirements and product acceptance criteria.

Definition of Inspection: An inspection involves examining a work product to determine if it conforms to documented standards. The results of an inspection generally include measurements and may be called reviews, peer reviews, audits, or walkthroughs in some application areas.

Focus: While quality assurance (Manage Quality) focuses on the processes used in the project, Control Quality (and specifically Inspection) focuses on the physical deliverables themselves.

Application: Inspections can be conducted at any level of the project. For example, the inspection of a single activity or the inspection of the final product of the project.

Comparison with Other Options:

Quality audits (A): This is a tool and technique of the Manage Quality (Quality Assurance) process. It is a structured, independent process to determine if project activities comply with organizational and project policies, processes, and procedures.

Process analysis (B): This is also a tool and technique of Manage Quality. It follows the steps outlined in the process improvement plan to identify needed improvements from an environmental and continuous improvement perspective.

Benchmarking (C): This is a tool and technique used in Plan Quality Management. it involves comparing actual or planned project practices to those of comparable projects to identify best practices and generate ideas for improvement.