Rationalize the Denominator and Simplify $\frac { 15 } { \sqrt { 5 x } }$

Multiple Choice

Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
- $\frac { 15 } { \sqrt { 5 x } }$

A) $\frac { 3 \sqrt { 5 x } } { x }$
B) $\frac { 15 \sqrt { x } } { x }$
C) $\frac { 15 \sqrt { 5 x } } { 5 x }$
D) $\frac { 3 \sqrt { 5 x } } { 5 x }$