On multiplying a number by 7 all the digit in the product appear as 3's , the smallest such numbers is -

Answer: Option C

$$\begin{array}{rl}& \text{According to question,}\\ & x\times 7=333333\end{array}$$
(In answer 5 digit number are given, so we take 6 digit 333333)
$$\begin{array}{rl}& x=\frac{333333}{7}\\ & x=47619\end{array}$$