Composite Function Help Needed!

Let  $f(x)=log (x^2-2x)$ and  $g(x) = \frac{x}{x-1}$. Which expression represents $f(g(x)$ ?

a)  $log (\frac{x^3 -2x^2}{x-1})$

b) $log(\frac{x^2-2x(x-1)}{(x-1)^2})$

c) $\frac{log(x^2-2x)}{log(x^2-2x)-1}$

d)  $\frac{xlog(x^2-2x)}{x-1}$