Which of the following is the best tool to report process improvements to a quality...

Detailed Explanation:

A control chart is ideal for reporting process improvements over time, as it demonstrates both stability and variations in a process.

Option D: Control Chart

Control charts visually display changes in a process post-intervention, making them ideal for reporting ongoing performance to qualitycommittees.

Options A, B, and C:

Histograms and scatterplots show data distribution but not process control, while flowcharts illustrate process steps rather than improvements.