Final answer:
The Expenses by Vendor Summary report in QuickBooks Online provides a summary of expenses broken down by vendor, allowing users to see how much they have spent with each vendor.
Step-by-step explanation:
The report in QuickBooks Online that would provide information about how much Kathryn has spent with each of her vendors last month is 2) Expenses by Vendor Summary.
The Expenses by Vendor Summary report in QuickBooks Online provides a summary of all expenses broken down by vendor, allowing users to see how much they have spent with each vendor. It includes details such as the total amount spent, the number of transactions, and the average transaction amount for each vendor.
To access the Expenses by Vendor Summary report in QuickBooks Online, click on the Reports tab, then select Expenses and vendors from the options on the left side of the screen. From there, choose Expenses by Vendor Summary and set the date range to the previous month.