Add or Subtract $4 \sqrt{5}+\frac{-2}{\sqrt{5}}$ A) $\frac{18 \sqrt{5}}{5 \sqrt{5}}$ B) $18 \sqrt{5}$ C) $\frac{18 \sqrt{5}}{5}$

Multiple Choice

Add or subtract. Simplify by collecting like radical terms, if possible.
- $4 \sqrt{5}+\frac{-2}{\sqrt{5}}$

A) $\frac{18 \sqrt{5}}{5 \sqrt{5}}$
B) $18 \sqrt{5}$
C) $\frac{18 \sqrt{5}}{5}$
D) $2 \sqrt{5}$