Which type of chart best shows how values change over time?

Which type of chart best shows how values change over time?

• A. Bar chart
• B. Pie chart
• C. Line chart
• D. Histogram

Answer: (C)

Showing changes over time is best done with a line chart. A line chart plots data points at successive time intervals and connects them with a line, making it easy to see rises, falls, and overall trends at a glance. Bar charts compare quantities across items or categories, which can hint at changes if you lay out time periods, but they don’t show smooth progression as clearly. Pie charts show parts of a whole at a single moment, not a sequence over time. Histograms show how often values occur within ranges, not how a value changes over time. So the line chart clearly reveals how values evolve.

Showing changes over time is best done with a line chart. A line chart plots data points at successive time intervals and connects them with a line, making it easy to see rises, falls, and overall trends at a glance. Bar charts compare quantities across items or categories, which can hint at changes if you lay out time periods, but they don’t show smooth progression as clearly. Pie charts show parts of a whole at a single moment, not a sequence over time. Histograms show how often values occur within ranges, not how a value changes over time. So the line chart clearly reveals how values evolve.