Which of the Following Would Be the Best Audit Procedure

Multiple Choice

Which of the following would be the best audit procedure to use to determine if a division's unusually high sales and gross margin for November and December were the result of fraudulently recorded sales?

A) Trace a sample of shipping documents to related sales invoices to verify proper billing.
B) Confirm accounts receivable balances with customers.
C) Compare sales and gross margin totals with those of the previous ten months and the first month of the following year.
D) Use regression analysis techniques to estimate the sales and cost of goods sold for November and December.