Shoppers Paradise, a Wholesaler, Ships Various Products Worldwide

Shoppers paradise, a wholesaler, ships various products worldwide. Some shipments are made to an individual customer and some are made on bulk orders that are mailed to multiple addresses. The company is considering how to best allocate the cost of shipping. Total monthly shared cost for the department is $20,000. The following data are available:
Which is the best method to allocate shared shipping costs?

A) Number of Addresses processed
B) Number of requests processed
C) Operating income
D) Either A or B