Critical Reasoning (CR) | Revision Project: Male bowerbirds construct elaborately decorated nest

I also want to add some more points for the options A and C,

Option A, There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.

It is talking about the extensive study. Although, more common characteristics of the bower building styles of the bower birds are studied most extensively, it actually does not matter whether the more common characteristics were studied or the differences
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