The solution of the system of equations whose Augmented matrix is $\left[\begin{array}{cccc}1& 2& 3& 6\\ 2& 4& 1& 7\\ 3& 2& 9& 14\end{array}\right]$ is

• A

  $x=1,y=1,z=–1$

• B

  $x=–1,y=1,z=1$

• C

  $x=1,y=–1,z=1$

• D

  $x=1,y=1,z=1$