Add or Subtract $\sqrt{5 a}-3 \sqrt{125 a}-2 \sqrt{20 a}$ A) $-18 \sqrt{5 a}$

Multiple Choice

Add or subtract. Assume all variables represent nonnegative real numbers.

- $\sqrt{5 a}-3 \sqrt{125 a}-2 \sqrt{20 a}$

A) $-18 \sqrt{5 a}$
B) $-5 \sqrt{5 a}$
C) $-5 \sqrt{150 \mathrm{a}}$
D) $-18 \sqrt{150 a}$