Ans: D
$\begin{array}{cl}
& 8^3 + 8^{19} \\
= & (2^3)^3 + (2^3)^{19} \\
= & 2^9 + 2^{57} \\
= & 2^{4\times 2 + 1} + 2^{4 \times 14 + 1} \\
= & 2 \times (2^4)^2 + 2 \times (2^4)^{14} \\
= & 2 \times 16^2 + 2 \times 16^{14} \\
= & 200\ 000\ 000\ 000\ 200_{16}
\end{array}$
$\begin{array}{cl}
& 8^3 + 8^{19} \\
= & (2^3)^3 + (2^3)^{19} \\
= & 2^9 + 2^{57} \\
= & 2^{4\times 2 + 1} + 2^{4 \times 14 + 1} \\
= & 2 \times (2^4)^2 + 2 \times (2^4)^{14} \\
= & 2 \times 16^2 + 2 \times 16^{14} \\
= & 200\ 000\ 000\ 000\ 200_{16}
\end{array}$
