Rewrite as a Single Logarithm Using the Quotient Rule for Logarithms

Multiple Choice

Rewrite as a single logarithm using the quotient rule for logarithms. Assume all variables represent positive real numbers.
- $\log _{7} 21-\log _{7} 17$

A) $\log _{7} \frac{17}{21}$
B) $\log _{7} 4$
C) $\log _{14} \frac{21}{17}$
D) $\log _{7} \frac{21}{17}$