Homologous structures are often cited as evidence for the process of natural selection. All of the following are examples of homologous structures EXCEPT
(A)the wings of a bird and the wings of a bat (B)the flippers of a whale and the arms of a man (C)the pectoral fins of a porpoise and the flippers of a seal (D)the forelegs of an insect and the forelimbs of a dog
D