Let $V(x)$ Represent the Volume in Cubic Feet of a Box with Box

Let $V(x)$ represent the volume in cubic feet of a box with square base of side length $x$ feet and height 7 feet. Let $T(x)$ represent the volume in cubic inches of a box with square base of side length $x$ inches and height 84 inches. Which of the following is the correct formula for $T(x)$ in terms of $V(x)$ ?

A) $T(m) =12 \cdot V(144 x)$
B) $T(m) =V(12 x)$
C) $T(m) =12 V(x)$
D) $T(m) =144 V(x)$