Between them, the two four-digit integers $$M$$ and $$N$$ contain all ten digits from $$1$$ to $$8$$.  What is the least possible difference between $$M$$ and $$N$$? 
选项为:A:$$123$$  B:$$247$$  C:$$427$$  D:$$472$$  E:$$742$$  请回答其中一个选项.