What type of diagram uses geometric figures to represent data flow in a computer system?

The correct choice involves understanding how geometric figures are utilized to represent data flow visually within a computer system. The Block-Arrow Diagram specifically uses blocks and arrows to illustrate the relationships and movement of data between components. The blocks represent processes or data stores, while the arrows show the direction of data flow, making it clear and easy to understand how data is processed within the system.

While flowcharts also display processes and data flow, they typically involve a variety of shapes with distinct meanings (like ovals, diamonds, and rectangles) that might not solely focus on geometric representation for data flow. Pseudocode, on the other hand, is textual representation of algorithms and doesn’t involve diagrammatic representations with geometric figures. Likewise, Data Structure Diagrams are more concerned with the organization of data rather than the flow of data throughout a system. Thus, the Block-Arrow Diagram distinctly fulfills the requirement of using geometric figures to illustrate data flow.