Tam is an office manager in charge of ordering and managing the use of office supplies. Lately, the office has been going through boxes of paper and copier ink very quickly, so Tam wants to compare the number of copies made during each of the last three months using the printing codes of the three executives in the office. Which type of chart would best help Tam make this comparison?

A)a clustered bar chart
B)an organizational chart
C)a bilateral column chart
D)a flowchart
E)a decision tree