Dennisport Corporation has an acid-test ratio of 2.5. It has current liabilities of $40,000 and noncurrent assets of $70,000. The corporation's current assets consist of cash, marketable securities, accounts receivable, prepaid expenses, and inventory; it has no short-term notes receivable. If Dennisport's current ratio is 3.1, its inventory and prepaid expenses must be:

A. $12,400

B. $24,000

C. $30,000

D.$40,000