Which One of the Following Is the Constant Matrix for the Following

Multiple Choice

Which one of the following is the constant matrix for the following systems of equations? $\left\{\begin{array}{r}4 x-9 y+3 z=8 \\4 x+2 z=3 \\7 y=7\end{array}\right.$

A) $\left[\begin{array}{ccc}4 & -9 & 3 \\4 & 0 & 2 \\0 & 7 & 0\end{array}\right]$
B) $\left[\begin{array}{lll}8 & 3 & 7\end{array}\right]$
C) $\left[\begin{array}{l}8 \\3 \\7\end{array}\right]$
D) $\left[\begin{array}{l}x \\y \\z\end{array}\right]$
E)