GWD-01 里的第二题，它的答案和PREP08里的答案不一样啊？

412372220

By merging its two publishing divisions, the company will increase their share of the country’s $21 billion book market from 6 percent to 10 percent, a market ranging from obscure textbooks to mass-market paperbacks.


their share of the country’s $21 billion book market from 6 percent to 10 percent, a market ranging(their 没有指代)


from 6 percent to 10 percent its share of the $21 billion book market in the country, which ranges


to 10 percent from 6 percent in their share of the $21 billion book market in the country, a market ranging（最好不要把from…to…的顺序颠倒？）


in its share, from 6 percent to 10 percent, of the $21 billion book market in the country, which ranges


to 10 percent from 6 percent its share of the country’s $21 billion book market, which ranges
可是刚在论坛里看到PREP的笔记：
考点：
指代一致（agreement） 逻辑意思（logical predication）
1.    the company是主语，指代也用单数。
2.    which的指代
选项分析：
A.    their指代the company错误。Ranging使得后面的分句没有谓语。
B.    which可以跳跃指代，但是此处which离其指代对象隔了一个状语in the country，而且country与ranges是gramatically matched的，故B不佳。
C.    their错误同A，ranging错误同A。
D.    which错误同B；of和要连接的对象离的太远不好。
E.    correct；which离其指代对象比B更近，因此更好，记住选项是比出来的；to…from…结构中to 10 percent提前以示强调；逻辑上讲，一个国家的图书市场不可能只有从from obscure textbooks to mass-market paperbacks，所以which逻辑上指代its share of the country's $21 billion book market整体。

from prep08语法笔记
到底是什么啊？求NN解答！