Add or Subtract $7 \sqrt { 8 } - 10 \sqrt { 162 } - 3 \sqrt { 72 }$

Multiple Choice

Add or subtract. Assume all variables represent positive real numbers.
- $7 \sqrt { 8 } - 10 \sqrt { 162 } - 3 \sqrt { 72 }$

A) $- 94 \sqrt { 2 }$
B) $260 \sqrt { 2 }$
C) $7 \sqrt { 2 }$
D) $- 260 \sqrt { 2 }$