Solve the Problem $\mathrm { A } ( \mathrm { x } ) = \frac { 3 } { 4 } \mathrm { x } ^ { 2 }$

Solve the problem.
-A wire of length 3x is bent into the shape of a square. Express the area A of the square as a function of x.

A) $\mathrm { A } ( \mathrm { x } ) = \frac { 3 } { 4 } \mathrm { x } ^ { 2 }$
B) $A ( x ) = \frac { 9 } { 16 } x ^ { 2 }$
C) $A ( x ) = \frac { 9 } { 8 } x ^ { 2 }$
D) $A ( x ) = \frac { 1 } { 16 } x ^ { 2 }$