天山4-7 鸟类和恐龙的渊源，求解～～请各位路过时来看看啊～～

Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced. They argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographica – the oldest known bird – appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods – the closest known relatives of birds – date only to about 115 million years ago. But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx. In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit. Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods. This objection was reasonable when only early theropod clavicles had been discovered, but fossilized theropod clavicles that look just like the wishbone of Archaeopteryx have now been unearthed. Finally, some scientists argue that the complex lungs of birds could not have evolved from theropod lungs, an assertion that cannot be supported or falsified at the moment, because no fossil lungs are preserved in the paleontological record.

Q7  Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?
A. There are no known theropod dinosaur fossils dating from a period after the time  of Archaeopteryx.
B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs’ lungs.
C. Theropod dinosaurs appear in the fossil record about 150 million years ago.
D. Theropod dinosaurs did not have fused clavicles.
E.Theropod dinosaurs had certain bones that look just like those of Archaeopteryx.

因为：
Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the (20) unfused clavicles of theropods

所以，T恐龙是有fused clavicles 的啊，只不过是长得不一样而已，而D说 did not have fused clavicles，怎么看D都是错的啊。。。
可答案就是选D。。。求解！