Simplify Assume All Variables Represent Positive Real Numbers $\frac { 5 z } { \sqrt { 13 z } }$

Multiple Choice

Simplify. Assume all variables represent positive real numbers.
- $\frac { 5 z } { \sqrt { 13 z } }$

A) $\frac { 5 \sqrt { 13 z } } { 13 }$
B) $\frac { \sqrt { 65 } } { 13 }$
C) $\frac { 5 \sqrt { 13 z } } { 169 z }$
D) $5 \sqrt { z }$