$\text{ Let }f\left(x\right)\text{ be any function continuous and twice differentiable function on }(a,b)\text{ . If for }$

$\begin{array}{l}\text{ all }x\in (a,b),f^{\text{'}}\left(x\right)>0\text{ and }{f}^{\text{'}\text{'}}\left(x\right)<0,\text{ then for any }c\in (a,b),\frac{f\left(c\right)-f\left(a\right)}{f\left(b\right)-f\left(c\right)}\text{ is greater }\\ \text{ than }\end{array}$

• A

  1

• B

  $\frac{c-a}{b-c}$

• C

  $\frac{b+a}{b-a}$

• D

  $\frac{b-c}{c-a}$