Which of the Following Information Needs Focuses on a Reservation

Which of the following information needs focuses on a reservation relationship in the acquisition/payment business process?

A) Calculation of the average dollar value of purchase orders of a specific inventory type for a specific time period.
B) Count of how many times a specific inventory type has been requisitioned for purchase during a specific time period.
C) Creation of an open purchase order file.
D) Calculation of the quantity of each inventory type, decreased by purchase returns during a specified time period.
E) Calculation of accounts payable for purchases.