A flowchart is a diagram that represents a process or workflow, typically using various shapes to illustrate different types of steps or actions. Among the options provided:
B. Control structure can be represented visually by a flowchart. Control structures (such as loops, conditionals, and branches) can easily be depicted using flowchart symbols to show the flow of control in a program.
The other options do not lend themselves as well to flowchart representation:
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A. Data type: This refers to the kind of data a variable can hold, which is more about categorization than a process.
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C. Binary code: This is a way of encoding information and isn't a process that can be illustrated using flowcharts.
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D. Syntax: This refers to the rules that define the structure of a language. While syntax rules can be outlined, they don't represent a process that can be illustrated in a flowchart format.
In summary, the answer is B. Control structure.