$\left\{ \begin{array} { c } x + y + z = 7 \\x - y + 2 z = 7 \\5 x + y + z = 11\end{array} \right.$

Multiple Choice

$\left\{ \begin{array} { c } x + y + z = 7 \\x - y + 2 z = 7 \\5 x + y + z = 11\end{array} \right.$

A) x=1, y=4, z=2
B) x=4, y=1, z=2
C) x=4, y=2, z=1
D) x=1, y=2, z=4