Add or Subtract $\sqrt { 6 a } - 7 \sqrt { 150 a } - 5 \sqrt { 216 a }$

Multiple Choice

Add or subtract. Assume all variables represent nonnegative real numbers.
- $\sqrt { 6 a } - 7 \sqrt { 150 a } - 5 \sqrt { 216 a }$

A) $- 64 \sqrt { 372 a }$
B) $- 12 \sqrt { 372 a }$
C) $- 64 \sqrt { 6 a }$
D) $- 12 \sqrt { 6 a }$