Allowance for doubtful accounts increased from the prior year, but allowance for doubtful accounts as a percentage of accounts receivable decreased from the prior year. Which of the following is not a possible explanation for this finding?
A. Items shipped on consignment during the last month of the year were recorded as sales.
B. A significant number of credit memos for returned merchandise that were issued during the last month of the year were not recorded.
C. A larger percentage of sales occurred during the last month of the year, as compared to the prior year.
D. Sales increased at a lower percentage than cost of goods sold increased, as compared to the prior year.