Simplify the Expression $6 \sqrt { 80 x ^ { 2 } } - 3 \sqrt { 45 x ^ { 2 } } - \sqrt { 5 x ^ { 2 } }$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $6 \sqrt { 80 x ^ { 2 } } - 3 \sqrt { 45 x ^ { 2 } } - \sqrt { 5 x ^ { 2 } }$

A) $2 x \sqrt { 35 }$
B) $15 \times \sqrt { 5 }$
C) $14 \times \sqrt { 5 }$
D) $3 x \sqrt { 35 }$