In Coinland, there are three types of coins, each worth 6,10, and 15. What is the sum of the digits of the maximum amount of money that is impossible to have?<spanclass=′latex−bold′>(A)</span>11<spanclass=′latex−bold′>(B)</span>6<spanclass=′latex−bold′>(C)</span>8<spanclass=′latex−bold′>(D)</span>9<spanclass=′latex−bold′>(E)</span>10
(I forgot the order)