Add or Subtract $- 2 \sqrt { 8 } - 2 \sqrt { 18 } - 8 \sqrt { 32 }$

Multiple Choice

Add or subtract. Assume all variables represent positive real numbers.
- $- 2 \sqrt { 8 } - 2 \sqrt { 18 } - 8 \sqrt { 32 }$

A) $- 12 \sqrt { 2 }$
B) $- 2 \sqrt { 2 }$
C) $- 42 \sqrt { 2 }$
D) $12 \sqrt { 2 }$