An Online Business Makes and Then Sells High-Value, Unique Pieces

An online business makes and then sells high-value, unique pieces of jewellery designed around Australian opals. Each opal has individual colour and pattern properties that make the pieces highly desirable. The website allows customers to place a selected piece of jewellery into a virtual shopping cart. Because of the high-value low-volume nature of the business, and as a unique selling point, at this point the item is removed from inventory and held for the customer. The customer has 72 hours to decide if they wish to proceed with the transaction. If the customer wishes to proceed, they must provide their payment details. Once funds are confirmed as transferred (this can take up to 48 hours) the item is shipped to the customer. Again because of the unique nature of each item, and as part of their commitment to customer service, the customer has a two-week, no questions asked, return window. A significant number of items is returned under this policy.
Which of the following is going to be the most significant risk the auditor is going to want to consider??

A) Agent versus principal considerations
B) The lack of credit checks of customers
C) Return of goods under warranty
D) When the transaction is deemed to have occurred