Identify the Elementary Row Operation Being Performed to Obtain the New

Multiple Choice

Identify the elementary row operation being performed to obtain the new rowequivalent matrix.
$\begin{array} { l r } \text { Original Matrix } & \text { New Row-Equivalent Matrix } \\ { \left[ \begin{array} { c c c } 7 & 6 & 6 \\ 1 & 4 & - 6 \end{array} \right] } & { \left[ \begin{array} { c c c } 12 & 26 & - 24 \\ 1 & 4 & - 6 \end{array} \right] } \end{array}$

A) Add 5 times $R _ { 1 }$ to $R _ { 2 }$ .
B) Add $- 5$ times $R _ { 2 }$ to $R _ { 1 }$ .
C) Add $- 5$ times $R _ { 1 }$ to $R _ { 2 }$ .
D) Add 5 times $R _ { 1 }$ to $R _ { 1 }$ .
E) Add 5 times $R _ { 2 }$ to $R _ { 1 }$ .