Simplify the Expression $6 \sqrt { 32 x ^ { 2 } } - 3 \sqrt { 18 x ^ { 2 } } - \sqrt { 2 x ^ { 2 } }$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $6 \sqrt { 32 x ^ { 2 } } - 3 \sqrt { 18 x ^ { 2 } } - \sqrt { 2 x ^ { 2 } }$

A) $2 x \sqrt { 14 }$
B) $14 x \sqrt { 2 }$
C) $3 x \sqrt { 14 }$
D) $15 x \sqrt { 2 }$