Simplify Assume All Variables Represent Positive Real Numbers $\frac { 6 a } { \sqrt { 7 } }$

Multiple Choice

Simplify. Assume all variables represent positive real numbers.
- $\frac { 6 a } { \sqrt { 7 } }$

A) $6 a \sqrt { 7 }$
B) $\frac { 36 a \sqrt { 7 } } { 7 }$
C) $\frac { 6 a \sqrt { 7 } } { 7 }$
D) 55