David has $500 to buy CDs and DVDs. CDs cost $12 and DVDs cost $20. Which of these is a combination of CDs and DVDs that David can buy?






(A) 5 CDs, 25 DVDs
(B) 10 CDs, 20 DVDs
(C) 15 CDs, 15 DVDs
(D) 35 CDs, 5 DVDs