Which of these pairs of body structures best illustrates a homologous relationship?

A) Leg of a horse and the leg of a dog.
The rest of the choices are examples of convergent evolution because they are similar in  structures that evolved in separate places in the animal kingdom.
>Bats are mammals and birds are not, yet they both evolved a similar appendage
Choices to this question are:
A) the leg of a horse and the leg of a dog
B) the wing of a bat and the wing of a bird
C) the fin of a dolphin and the fin of a shark
D) the beak of a bird and the beak of a turtle

My pigs teeth have already came in years ago, with my first molars, and my second molars are pretty much in. my wisdom teeth will be unable to come in, but i'm getting those out on monday.