The element that is often found on a pie chart is legend.
A pie chart can be described as the circular statistical graphic that is been used in mathematics as well as in statistics and this is usually divided into slices.
An this is been used in getting illustration about the numerical proportion, however legend is one of the important element that is contained in the chart which is the element that help in the division of the circle and help to know the chart is been sectioned into different parts to demonstrate the information there.
Therefore, option B is correct.
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CHECK THE COMPLETE QUESTION:
What element is often found on pie charts?
headers
legend
horizontal axis
vertical axis