Express as a Single Logarithm And, If Possible, Simplify $\ln \cos \theta - \ln \left( \frac { \cos \theta } { 10 } \right)$

Multiple Choice

Express as a single logarithm and, if possible, simplify.
- $\ln \cos \theta - \ln \left( \frac { \cos \theta } { 10 } \right)$

A) $\ln \cos \theta$
B) $\ln \left( \frac { 1 } { 10 } \right)$
C) $\ln \left( \frac { \cos ^ { 2 } \theta } { 10 } \right)$
D) $\ln 10$