【单选题】

Thepassage is primarily concerned with
A．(A)contrasting the role of domination and courtship in determining the evolution of bird plumage

B．(B)illustrating the effectiveness of a particular approach to categorizing various evolutionary innovations
C．(C)documenting the origins of a currently accepted scientific theory about food and courtship
D．(D)proposing a new explanation for the evolutionary reasons behind the ornamentation of male bird plumage
E．(E)showing that physical adaptation plays an integral role in contributing to species identification of birds