$$0.1\times 0.2\times 0.3=$$~\uline{~~~~~~~~~~}~. 
Overseas Competition->Knowledge Point->Calculation Modules->Decimals->Multiplication and Division of Decimals
$$0.1\times 0.2\times 0.3=(0.1\times 0.2)\times 0.3=0.02\times 0.3=0.006$$. Therefore, the answer is $$\rm B$$. 