Fill in the Blank(s)using Elementary Row Operations to Form a Row-Equivalent

Multiple Choice

Fill in the blank(s) using elementary row operations to form a row-equivalent matrix. ​​ $$\left[ \begin{array} { c c c } 6 & 9 & 4 \\5 & - 4 & 7\end{array} \right]$$ ​ $$\left[ \begin{array} { c c c } 2 & \cdots & \frac { 4 } { 3 } \\5 & - 4 & 7\end{array} \right]$$ ​

A) ​ $$\left[ \begin{array} { c c c } 2 & 9 & \frac { 4 } { 3 } \\5 & - 4 & 7\end{array} \right]$$
B) ​ $$\left[ \begin{array} { c c c } 2 & 2 & \frac { 4 } { 3 } \\5 & - 4 & 7\end{array} \right]$$
C) ​ $$\left[ \begin{array} { l l l } 2 & - 3 & \frac { 4 } { 3 } \\5 & - 4 & 7\end{array} \right]$$
D) ​ $$\left[ \begin{array} { c c c } 2 & 5 & \frac { 4 } { 3 } \\5 & - 4 & 7\end{array} \right]$$
E) ​ $$\left[ \begin{array} { c c c } 2 & 3 & \frac { 4 } { 3 } \\5 & - 4 & 7\end{array} \right]$$