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