Which of the following is a quality control chart to track trends in project execution?

A control chart plots data points sequentially over time against a calculated mean and upper and lower control limits, making it purpose-built for tracking trends and identifying when a process drifts out of statistical control. In project quality management, it is used during project execution to distinguish normal variation from assignable causes that require corrective action. The PMBOK Guide explicitly identifies the control chart as a tool for the Control Quality process.

A RACI chart is a responsibility assignment matrix that maps team members to project tasks - it is an organizational tool, not a quality or statistical tracking chart.

A PERT chart (Program Evaluation and Review Technique) is a network diagram used for schedule planning and estimating task durations - it has no role in quality trend monitoring.

A Pareto chart ranks defect types or quality issues by frequency to prioritize corrective actions using the 80/20 principle - it is a snapshot diagnostic tool, not a trend-tracking chart over time.