Ans: B
$\begin{array}{cl}
& (2x)^3 \cdot x^3 \\
= & 2^3 \cdot x^3 \cdot x^3 \\
= & 8 x^{3+3} \\
= & 8x^6
\end{array}$
$\begin{array}{cl}
& (2x)^3 \cdot x^3 \\
= & 2^3 \cdot x^3 \cdot x^3 \\
= & 8 x^{3+3} \\
= & 8x^6
\end{array}$
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