OG-66(链接中无), 解释

OG66

Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds’ building styles are a culturally acquired, rather than a genetically transmitted, trait.

Which of the following, if true, would most strengthen the conclusion drawn by the researchers?

(A) There are more common characteristics than there are differences among the bower-building styles of the local bowerbird population that has been studied most extensively.

(B) Young male bowerbirds are inept at bower-building and apparently spend years watching their elders before becoming accomplished in the local bower style.

(C) The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

(D) Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.（B）

(E) It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.

答案没问题，就是OG关于A.D的解释没看懂，请帮忙解释，谢谢！

OG关于A.D的解释：

That differences within building styles are outnumbered by similarities (choince A) and that local populations have little contact (choice D) are both equally consistent with building style differences being culturally acquired or genetically transmitted.

我的理解是A选项应该是genetically transmitted, 但若是D表示的是culturally acquired, 那它可以strengthen the conclusion吗？另外，OG的解释为何要这样表达？

UP!

老是没有人回答，每次review帖子也蛮花时间的，请大家帮助啊!!!

Up!!!

是说在选项A和D中，后天习得与遗传在确定建筑风格上，是无差别的；也就是说，无法确定是建筑风格是后天习得还是遗传的。

同时不存在，对其影响也是无差别的。即是无关选项阿。