Write the Expression as a Single Logarithm with Coefficient 1 $a \neq 1 \text { and } b \neq 1$

Multiple Choice

Write the expression as a single logarithm with coefficient 1. Assume all variables represent positive real numbers with $a \neq 1 \text { and } b \neq 1$ .
- $\log _ { 6 } 13 - \log _ { 6 } x$

A) $\log _ { 6 } \left( \frac { 13 } { x } \right)$
B) $\log _ { 12 } \left( \frac { 13 } { x } \right)$
C) $\log _ { 6 } ( 13 - x )$
D) $\log _ { 6 } \left( \frac { x } { 13 } \right)$