Given here is representation of the extent of global diversity of vertebrates. What groups do the portions represent?
A.a - fishes, b - mammals, c - birds, d reptiles, e amphibians
B.a - fishes, b amphibians, c - mammals, d - birds, e reptiles
C.a - mammals, b - birds, c - fishes, d - amphibians, e reptiles
D.a - birds, b - reptiles, c fishes, d mammals, e amphibians