求教两道白勇语法的题，纠结

A recent national study of the public schools shows that there are now one microcomputer for every thirty-two pupils, four times as many than there were four years ago.

• Athere are now one microcomputer for every thirty-two pupils, four times as many than there were  
• Bthere is now one microcomputer for every thirty-two pupils, four times as many than there were  
• Cthere is now one microcomputer for every thirty-two pupils, four times as many as there were
• Devery thirty-two pupils now have one microcomputer, four times as many than there were  
• Eevery thirty-two pupils now has one microcomputer, four times as many as
• 这题我想选E来着，C there is     there were看着不可比啊
  

10. Like the color-discriminating apparatus of the human eye, insects’ eyes depend on recording and comparing light intensities in three regions of the electromagnetic spectrum.

　　(A) insects’ eyes depend on

　　(B) an insect eye depends on

　　(C) that of insects depend on the

　　(D) that of an insect’s eye depends on(D)

　　(E) that of an insect’s is dependent on the

de 难道不是同样的错误吗，OF后面跟了所有格，C错在哪里？