Which element in a control flow diagram represents a process that always executes each statement?

A process block is the element in a control flow diagram that signifies a series of operations or actions that are executed sequentially. When visualizing the flow of a program or system, a process block encapsulates a specific operation or a group of actions that will always run when that part of the flow is reached. This is fundamental to understanding how processes are structured in programming and system design.

The process block effectively communicates that a certain task or calculation will take place, and thus every statement within it will always execute in the order they are specified, assuming the control flow reaches that block. This is crucial for understanding program behavior, especially when diagnosing or maintaining code.

In contrast, other elements like decision points are used to represent branching in the flow, junction points indicate convergence of control flows, and case statements are typically associated with conditional execution rather than guaranteed execution. Thus, the process block serves as the definitive representation of an always-executing set of statements within a control flow diagram.