The correct answers are: Customers are taking longer to pay than they used to; Credit terms to receivables have changed; The accounting records on which the calculation has been based may be inaccurate; Cash may have been misappropriated.

If customers are taking longer to pay than they used to, receivable days may rise. If credit terms have changed, receivables may be paying more slowly. If the accounting records on which the calculation has been based are inaccurate, receivable days may appear to rise. If cash has been misappropriated, it may appear that receivable days have risen.

If customers are paying more promptly than they used to, receivable days will fall.