Obtain an Equivalent System by Performing the Stated Elementary Operation $1 / 8$

Obtain an equivalent system by performing the stated elementary operation on the system.
-Multiply the third equation by $1 / 8$ .
$7 x-y+8 z+w=-10$
$8 \mathrm{x} \quad-\mathrm{z}-2 \mathrm{w}=7$
$8 x-16 y+7 z-w=-24$
$\mathrm{x}+3 \mathrm{y}-8 \mathrm{z}=1$

A) $7 x-y+8 z+w=-10$
$8 x \quad-z-2 w=7$
$\mathrm{x}-16 \mathrm{y}+7 \mathrm{z}-\mathrm{w}=-24$
$\mathrm{x}+3 \mathrm{y}-8 \mathrm{z}=1$
B) $7 x-y+8 z+w=-10$
$8 x-z-2 w=7$
$x-2 y+\frac{7}{8} z-\frac{1}{8} w=-24$
$x+3 y-8 z \quad=1$
C) $7 x-y+8 z+w=-10$
$8 x-z-2 w=7$
$x-2 y+\frac{7}{8} z-\frac{1}{8} w=-3$
$\mathrm{x}+3 \mathrm{y}-8 \mathrm{z}=1$
D) $7 x-y+8 z+w=-10$
$8 x-z-2 w=7$
$x-2 y+\frac{7}{8} z+\frac{1}{8} w=-24$
$\mathrm{x}+3 \mathrm{y}-8 \mathrm{z} \quad=1$