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

答案是B，但是我E比较好，B中的which可以理解为修饰country,指代模糊，但是E中的which指代明确，请哪位NN解释一下下。谢拉

from..to.. is the correct phrase. Inverted form also makes sense in daily use, but not in GMAT.

"book market in the countrym which ranges from..." is just fine...  A reasonable distance between the referent and modifiers is nothing to be concerned about, as long as it doesn't cause ambiguity!