
Passage: Naturalists have observed that in a flock of birds, there is usually a strict hierarchy and high-status birds bully low-status birds. The darker the color of the feathers on the head, the thicker the stripes of the chest feathers, the higher the rank, and vice versa. Naturalists also observed that the older the bird is, the darker the feathers on its head are and the thicker the stripes of its chest feathers are. This shows that the status of birds in a group is gradually established through long-term common life.
Question: Which of the followings, if true,would most strongly weakens the above argument?
A. A.The head and chest feathers of a young inferior bird were painted with the colors and stripes of a high bird and placed in another group of similar birds, which received high treatment in the new group.
B. B.People cannot identify the status of white swans in a group by the color of their head feathers or the stripes of their chest feathers, because the color of their feathers is indistinguishable and their chest feathers have no stripes.
C. C.If there is a strict hierarchy in the bird world, then in a flock of birds, they will also struggle to improve their status.
D. D.If there is a strict hierarchy in the bird world, then their status in a flock of birds will not remain the same for life.
Answer: