The best visual for illustrating a manufacturer's quality control process would be a

A) line chart.
B) flowchart.
C) scatter diagram.
D) pie chart.

A flowchart is the best visual for illustrating a manufacturer's quality control process as it can illustrate the various stages involved in the process and the decision points along the way. It helps to identify potential issues and areas for improvement in the process. The other options, such as line charts, scatter diagrams, and pie charts, are not relevant for illustrating a quality control process.