请教两道GWD1里面的语法问题

GWD1-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.

A.    their share of the country’s $21 billion book market from 6 percent to 10 percent, a market ranging
B.    from 6 percent to 10 percent its share of the $21 billion book market in the country, which ranges
C.    to 10 percent from 6 percent in their share of the $21 billion book market in the country, a market ranging
D.    in its share, from 6 percent to 10 percent, of the $21 billion book market in the country, which ranges
E.    ？to 10 percent from 6 percent its share of the country’s $21 billion book market, which ranges
为什么是B呢？which不是应该修饰的是market吗？
YES. IN B, which is describing market. the center word of "book market in the country" is "market", not "the country"

GWD1-Q7:
A recent review of pay scales indicates that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times in 1980.

A.    that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times
B.    ？that, on average, CEO’s now earn 419 times the pay of blue-collar workers, a ratio that compares to 42 times
C.    that, on average, CEO’s now earn 419 times the pay of blue-collar workers, as compared to 42 times their pay, the ratio
D.    CEO’s who now earn on average 419 times more pay than blue-collar workers, as compared to 42 times their pay, the ratio
E.    CEO’s now earning an average of 419 times the pay of blue-collar workers, compared to the ratio of 42 times
答案是C，对B不是很清楚。
In B, "a ratio" has no correct 先行词, "CEO’s now earn 419 times the pay of blue-collar workers" is a complete sentence, "blue-collar workers" can't be the 先行词
先谢过了！