[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's find the volume of the given figure ~
[tex]\qquad \sf \dashrightarrow \:Volume_{(cuboid)}= length \cdot width \cdot height [/tex]
[tex]\qquad \sf \dashrightarrow \:Volume_{(cuboid)}= 4 \cdot x \cdot x [/tex]
[tex]\qquad \sf \dashrightarrow \:Volume_{(cuboid)}= 4 {x}^{2} [/tex]
So, the correct choice is ~ C
