Final answer:
An administrator can use the Stacked Bar Chart to compare opportunity amounts by rep and then by state.
Step-by-step explanation:
An administrator can use the Stacked Bar Chart to compare opportunity amounts first by rep, and then by state. In a stacked bar chart, each bar is divided into segments representing different categories. By using this chart type, the administrator can compare the total opportunity amounts for each rep, while also seeing the distribution of amounts across different states.