The administration at Community Physician's Hospital are interested in determining if they need to increase the number of physicians in order to see patients in a timely manner. The administrator asks the HIM manager to construct a graph that will show the following percentages about appointments in the following categories: patients who waited two to four weeks to see the physician, patients who waited one to two weeks to see a physician, patients who waited one week or less, and patients who were able to have an appointment on the day they called. Which would be the best graph to show this information?

a. Line graph

b. Bar graph

c. Pie chart

d. Scattergram