Fossil X is older than fossil Y because

Question

$\begin{array}{1 1} (a)\;\text{Fossil X was found in deeper sedimentation.} \\ (b)\;\text{Fossil Y was found in deeper sedimentation} \\ (c)\;\text{Fossil Y has homologus and analogus organs of X} \\ (d)\;\text{Fossil Y has some vestigial organs functional in X} \end{array}$