There are four different natural numbers, the sum of any two of them is a multiple of $$2$$, and the product of any three numbers is a multiple of $$3$$. In order to make the sum of these four numbers as small as possible, these four numbers are ． 
选项为:A:$$1$$，$$3$$，$$5$$，$$9$$  B:$$3$$，$$9$$，$$15$$，$$21$$  C:$$1$$，$$3$$，$$7$$，$$9$$  D:$$3$$，$$6$$，$$9$$，$$12$$  请回答其中一个选项.