Write as a Logarithm of a Single Expression $\frac { 1 } { 2 } \left( \log _ { 6 } ( r - 3 ) - \log _ { 6 } r \right)$

Multiple Choice

Write as a logarithm of a single expression.
- $\frac { 1 } { 2 } \left( \log _ { 6 } ( r - 3 ) - \log _ { 6 } r \right)$

A) $\log _ { 6 } \frac { r - 3 } { \sqrt { r } }$
B) $\log _ { 6 } \frac { \sqrt { r - 3 } } { r }$
C) $\log _ { 6 } \sqrt { \frac { r - 3 } { r } }$
D) $\log _ { 6 } \sqrt { \frac { r - 3 } { 2 r } }$