Which of the following represents the duration of activities against a calendar?

A pie chart represents proportional relationships as slices of a circle and contains no time axis or duration information.

A scatter chart plots individual data points on X-Y axes to show correlations or distributions between two variables, not activity durations.

A Gantt chart plots each activity as a bar whose length corresponds to its duration, positioned along a time axis that represents the calendar. This format makes it immediately clear when each activity starts, how long it lasts, and how activities overlap, making it the definitive tool for schedule visualization.

A Pareto chart is a descending bar chart used in quality management to rank defect types by frequency or impact, not to represent schedule information.