Add or Subtract $\sqrt { 5 a } - 2 \sqrt { 80 a } - 6 \sqrt { 125 a }$

Multiple Choice

Add or subtract. Assume all variables represent positive real numbers.
- $\sqrt { 5 a } - 2 \sqrt { 80 a } - 6 \sqrt { 125 a }$

A) $- 8 \sqrt { 210 a }$
B) $- 37 \sqrt { 5 a }$
C) $- 8 \sqrt { 5 a }$
D) $- 37 \sqrt { 210 a }$