Rationalize the Numerator and Simplify $\frac { \sqrt { 5 } } { \sqrt { 3 x } }$

Multiple Choice

Rationalize the numerator and simplify. Assume all variables represent positive real numbers.
- $\frac { \sqrt { 5 } } { \sqrt { 3 x } }$

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