Q2:

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.

1. their share of the country’s $21 billion book market from 6 percent to 10 percent, a market ranging
2. from 6 percent to 10 percent its share of the $21 billion book market in the country, which ranges
3. to 10 percent from 6 percent in their share of the $21 billion book market in the country, a market ranging
4. in its share, from 6 percent to 10 percent, of the $21 billion book market in the country, which ranges
5. to 10 percent from 6 percent its share of the country’s $21 billion book market, which ranges

大家都在讨论 B OR E ,

这里想问的语言点是，E中的6 percent 和its share之间不用加介词之类的吗？

is E?

to 10 percent from 6 percent 是插入语吧？

The given answer is B, but I think it should be E.  The word "which" in B modifies the word "country", when it should be used to modify "market". I know the phrase "to 10% from 6%" is awkward in E, but still it is grammatically correct。