Which of the Following Statements Concerning the Estimation of Bad

Which of the following statements concerning the estimation of bad debt expense by using a percentage of credit sales is incorrect?

A) Produces the same results, as an aging of accounts receivable.
B) Causes an adjustment to the allowance account without regard to the balance in that account immediately prior to the adjustment.
C) Is based primarily on the matching principle.
D) Emphasizes the income statement.
E) Only incidentally measures accounts receivable at net realizable value.