Fill in the Blank(s) Using Elementary Row Operations to Form $\left[ \begin{array} { c c c } 1 & 1 & 1 \\5 & - 2 & 4\end{array} \right]$

Multiple Choice

Fill in the blank(s) using elementary row operations to form a row-equivalent matrix. $\left[ \begin{array} { c c c } 1 & 1 & 1 \\5 & - 2 & 4\end{array} \right]$ $\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & \cdots & - 1\end{array} \right]$

A) $\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & 3 & - 1\end{array} \right]$
B) $\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & 0 & - 1\end{array} \right]$
C) $\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & - 9 & - 1\end{array} \right]$
D) $\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & - 7 & - 1\end{array} \right]$
E) $\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & 7 & - 1\end{array} \right]$