\[\]
Which of the following represents the sum of the two matrices?
\[
\begin{pmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{pmatrix}
+
\begin{pmatrix}
9 & 8 & 7 \\
6 & 5 & 4 \\
3 & 2 & 1
\end{pmatrix}
=
\]
(A). \[
\begin{pmatrix}
10 & 10 & 10 \\
10 & 10 & 10 \\
10 & 10 & 10
\end{pmatrix}
\]
(B). \[
\begin{pmatrix}
8 & 6 & 4 \\
2 & 0 & -2 \\
-4 & -6 & -8
\end{pmatrix}
\]