In the figure given below, if $LM \parallel CB$ and $LN \parallel CD$. Then which of the following statement is correct ?

Question

$\begin{array}{1 1} (a)\; \dfrac{AL}{AC}=\dfrac{AB}{AM} \\(b)\;\dfrac{AM}{AB}=\dfrac{AM}{AL} \\ (c)\; \dfrac{AN}{AD}= \dfrac{AM}{AC}\\ (d)\;\dfrac{AM}{AB}=\dfrac{AN}{AD} \end{array}$