Simplify Assume That All Variables Represent Positive Real Numbers $\frac { \sqrt { 168 } } { \sqrt { 6 } }$

Multiple Choice

Simplify. Assume that all variables represent positive real numbers.
- $\frac { \sqrt { 168 } } { \sqrt { 6 } }$

A) $\frac { \sqrt { 1008 } } { 6 }$
B) $2 \sqrt { 7 }$
C) 6
D) $\frac { \sqrt { 168 } } { 6 }$