Step-by-step Solution:

Among the given options: \[\] Algorithm: A step-by-step sequence of instructions to solve a problem, but it is written in textual form, not graphical. \[\] - Pseudocode: A structured way of representing an algorithm in a simplified format, using natural language and programming constructs but not graphical representation. \[\] - Flowchart: A diagrammatic or graphical representation that visually shows the sequence of steps in a program. It maps out logic flow using symbols like decision nodes, processes, and arrows. \[\] - Top-down design: A programming approach where the system is broken into smaller sub-problems, but it does not involve graphical representation.\[\] From the above, a flowchart is a structured programming technique that graphically represents the detailed steps required to solve a program. \[\] Correct Option: (c)