SOLUTION
We want to express as a single logarithm
[tex]\ln x+2\ln y-\ln z[/tex]
This becomes
[tex]\begin{gathered} \ln x+2\ln y-\ln z \\ \ln x+\ln y^2-\ln z \\ \text{addition, we multiply and subtraction, we divide} \\ \ln (xy^2)-\ln z \\ \ln (\frac{xy^2}{z}) \end{gathered}[/tex]
The 3rd option is the correct answer
