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if a female is put in a cage next to the bird, we lose the need to attract females--one is already present (though unable to get through bars).What the LSAT test writers are going for with (D) is that there's a cause-effect relationship: a female being present makes the male starlings use more aromatic plants in decorating their nests. The fact that it is caged is besides the point in the terms of "attraction" being used in the stimulus. That is, one might argue that the males couldn't "attract" a caged bird--but that's injecting too much unknown information, if the suggestion is that the caged bird couldn't move. For all we know, for example, it might be a large cage. In that case, (D) is reinforcing the mentioned cause-and-effect relationship.