Provide an Appropriate Response $$\left[ \begin{array} { r r r | r } 1 & - 9 & 1 & 4 \\0 & - 1 & - 13 & - 8 \\0 & - 3 & - 2 & - 11\end{array} \right]$$

Multiple Choice

Provide an appropriate response.
-Suppose that you are solving a system of three linear equations by the Gauss-Jordan method and obtain the following augmented matrix.
$$\left[ \begin{array} { r r r | r } 1 & - 9 & 1 & 4 \\0 & - 1 & - 13 & - 8 \\0 & - 3 & - 2 & - 11\end{array} \right]$$
What row operation would you perform next?

A) Multiply row 1 by $- \frac { 1 } { 9 }$ .
B) Add 3 times row 1 to $- 9$ times row 3 to obtain a zero in the third row, second column position.
C) Add row 1 to row $2 .$
D) Multiply row 2 by $- 1$ .