There are $$24$$ four-digit numbers which is formed using each of the digits $$3$$, $$4$$, $$5$$ and $$6$$ once only. When all of these $$24$$ four-digit numbers are put in order from smallest to largest, which one is in the seventh position? 
选项为:A:$$3546$$  B:$$3645$$  C:$$4356$$  D:$$4536$$  E:$$5346$$  请回答其中一个选项.