Write the Expression as the Logarithm of a Single Number $\ln (10 x+1)+\ln (x+8)$

Multiple Choice

Write the expression as the logarithm of a single number or expression with a coefficient of 1. Assume all variables represent positive numbers.
- $\ln (10 x+1) +\ln (x+8)$

A) $\ln \left(\frac{10 x+1}{x+8}\right)$
B) $\ln (11 x+9)$
C) $\ln \left(10 x^{2}+9 x+80\right)$
D) $\ln \left(10 x^{2}+81 x+8\right)$