Ans: A
$\begin{array}{cl}
& 11~000~011~000~111_2 \\
= & 1 \times 2^{13} + 1 \times 2^{12} + 0 \times 2^{11} + 0 \times 2^{10} + 0 \times 2^9 + 0 \times 2^8 + 1\times 2^7 + 1 \times 2^6 + 0 \times 2^5 + 0 \times 2^4 + 0 \times 2^3 + 1 \times 2^2 + 1 \times 2^1 + 1 \times 2^0 \\
= & 2^{13} + 2^{12} + 2^7 + 2^6 + 2^2 + 2^2 + 1 \\
= & 2^{13} + 2^{12} + 2^7 + 2^6 + 7
\end{array}$
$\begin{array}{cl}
& 11~000~011~000~111_2 \\
= & 1 \times 2^{13} + 1 \times 2^{12} + 0 \times 2^{11} + 0 \times 2^{10} + 0 \times 2^9 + 0 \times 2^8 + 1\times 2^7 + 1 \times 2^6 + 0 \times 2^5 + 0 \times 2^4 + 0 \times 2^3 + 1 \times 2^2 + 1 \times 2^1 + 1 \times 2^0 \\
= & 2^{13} + 2^{12} + 2^7 + 2^6 + 2^2 + 2^2 + 1 \\
= & 2^{13} + 2^{12} + 2^7 + 2^6 + 7
\end{array}$
