$\begin{array}{1 1}(A)\;226\\(B)\;326\\(C)\;336\\(D)\;436\end{array} $

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There are 10 digits from 0 to 9

I place after 67 can be filled in 8 ways.

II place after 67 can be filled in 7 ways.

III place after 67 can be filled in 6 ways.

$\therefore$ No of telephone numbers that can be constructed.

$\Rightarrow 8\times 7\times 6$

$\Rightarrow 336$

Hence (C) is the correct answer.

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