$$\left(\left(\left(\frac 12\div \frac 13\right)\div \frac 14\right)\div \frac 14\right)=$$~\uline{~~~~~~~~~~}~. ($$1986-87$$ MATHCOUNTS, G$$7$$, Problem $$29$$) 
选项为:A:$$\frac 1{48}$$  B:$$24$$  C:$$48$$  D:$$96$$  请回答其中一个选项.