$\left\{ \begin{array} { c } x - y + 3 z = - 8 \\2 x + z = 0 \\x + 5 y + z = 40\end{array} \right.$

Multiple Choice

$\left\{ \begin{array} { c } x - y + 3 z = - 8 \\2 x + z = 0 \\x + 5 y + z = 40\end{array} \right.$

A) x=0, y=8, z=0
B) x=0, y=-8, z=-8
C) x=8, y=8, z=0
D) x=-8, y=0, z=0