"Schematic used to investigate movement of people or material" describes a(n)

A) flow diagram.
B) activity chart.
C) operations chart.
D) right-hand / left-hand chart.
E) Gantt chart.

A flow diagram is a visual representation of the movement of people or material, showing the steps or stages involved and how they are connected. It is often used to analyze processes and identify areas for improvement. Activity charts and operations charts are also used for process analysis, but are more specific to certain industries or types of processes. Right-hand / left-hand charts are used to analyze physical movements, and Gantt charts are used for project management.