请教大全282 （未讨论的问题）

请教大全282 （未讨论的问题）

Even though Béla Bartók’s music has proved less popular than Igor Stravinsky’s and less influential than Arnold Schonberg’s, it is no less important.

(A) Stravinsky’s and less influential than Arnold Schonberg’s, it

(B) Stravinsky’s and less influential than Arnold Schonberg’s, he

(C) Stravinsky’s is and less influential than Arnold Schonberg’s is, it

(D) Stravinsky and not as influential as Arnold Schonberg, he（A）

(E) Stravinsky and not as influential as Arnold Schonberg, it
    

请问C 为什么不对。本来也是想选A 的，但刚好看到OG 上的一个题目，改选了A, 该题如下

19. In addition to having more protein than wheat does, the protein in rice is higher quality than that in wheat, with more of the amino acids essential to the human diet.

(A)
                the protein in rice is higher quality than that in

(B)
                rice has protein of higher quality than that in

(C)
                the protein in rice is higher in quality than it is in

(D)
                rice protein is higher in quality than it is in

(E)
                rice has a protein higher in quality than

In this sentence, the initial clause modifies the nearest noun, identifying it as the thing being compared with wheat. By making protein the noun modified, choices A, C, and D illogically compare wheat with protein and claim that the protein in rice has more protein than wheat does. In C and D, the comparative structure higher in quality than it is in wheat absurdly suggests that rice protein contains wheat. B, the best choice, logically compares wheat to rice by placing the noun rice immediately after the initial clause. B also uses that to refer to protein in making the comparison between the proteins of rice and wheat. Choice E needs either that in or does after wheat to make a complete and logical comparison. 结构完整性

于是参照结构完整性，保留系动词IS，选了C. 请问我的思路哪出了错？