A doctor wants to create a graph to highlight the percentages of her patients who are various ages.

The results are below:

Under 20 years old: 25 patients

Age 21 to 40: 15 patients

Age 41 to 60: 23 patients

Age 61 to 80: 13 patients

Over 80: 10 patients

Which graph is the best choice for the doctor to use to represent the data?