There are $$10$$ cards in a box, which numbered $$1$$, $$3$$, $$4$$, $$6$$, $$7$$, $$11$$, $$15$$, $$16$$, $$18$$, and $$20$$, respectively. Cathy picks a card from the box randomly. What is the probability the number on the card that Cathy picks is a multiple of $3$? 
选项为:A:$\frac 1{10}$  B:$\frac 3{10}$  C:$\frac 2{5}$  D:$\frac 1{2}$  E:$\frac 3{5}$  请回答其中一个选项.