Final answer:
A line graph is best for showing actual and budgeted expenses over time, while a bar chart is good for side-by-side comparisons; pie charts are less suitable for this purpose.
Step-by-step explanation:
To show actual and budgeted expenses over the last five years for your company, the line graph is the best option. Line graphs are useful for displaying data points over time and showing trends. A bar chart would also be effective, especially for comparing the actual versus budgeted expenses side by side for each year. Since pie charts are better at showing how a group is divided at one point in time, and not over a series of time periods, they would not be suitable for this data. A Gantt chart is primarily used for project management to illustrate a project schedule and would not effectively show the comparison of expenses over time.