Solve
-Find the Volume of the Rectangular Solid $4 x ^ { 3 } - 38 x ^ { 2 } + 84 x$

Multiple Choice

Solve.
-Find the volume of the rectangular solid. Express the volume as a product, then multiply and simplify.

A) $4 x ^ { 3 } - 38 x ^ { 2 } + 84 x$
B) $4 x ^ { 2 } - 38 x + 85$
C) $- 4 x ^ { 2 } + 18 x + 85$
D) $- 4 x ^ { 3 } + 18 x ^ { 2 } + 84 x$