A：无法确定

B：$\frac{g\left(t\right)}{t}<\frac{g\left(s\right)}{s}<\frac{g\left(r\right)}{r}$

C：$\frac{g\left(r\right)}{r}<\frac{g\left(s\right)}{s}<\frac{g\left(t\right)}{t}$

D：$\frac{g\left(s\right)}{s}<\frac{g\left(t\right)}{t}<\frac{g\left(r\right)}{r}$