Which of the following is a vestigial organ in a python?

Which one among the following is an example of homology?

The eye of an octopus and the eye of a cat show different patterns of structure,yet they perform similar functions. This is an example of:

Choose the correct statements with reference to organic evolution.
$I.$ Flippers of whale and wings of bat exhibit analogy.
$II.$ Wings of butterfly and wings of bird exhibit homology.
$III.$ Organs with dissimilar structure are called analogous organs.
$IV.$ Organs with similar structure and origin are called homologous organs.

$A$: Blood group analysis shows that human beings are more closely related to apes than to monkeys.
$R$: The blood groups $A$ and $B$ are found in apes but not in monkeys.

Provide the scientific reason for the statement: 'Ontogeny repeats phylogeny'.