A male jackdaw's courtship behaviour ios astonishingly human. All his movements are consciously strained and his proudly reared head and neck are permanently in a state of self-display. He provokes the other jackdaws continually if the female jacdaw is looking on and he purposefully becomes embroiled in conflicts with otherwise deeply respected superiors. About all, he seeks to impress his loved one with the possession of a potential nesting site, from which he derives all other jackdaws, irrespective of their rank.
The jackdaw fights with other jackdaws because

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A. the behaviour of a jackdaw who shows off his feathers
B. the behaviour of a male bird to attract a female bird
C. the behaviour by which a male bird displays its beauty to the female bird
D. the behaviour of any male to win a female of the same species