请教一道GWD语法题目

gmatziyu

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
请问答案为什么是B呢？a ratio that compares to...在句中是起什么作用呢？谢谢！A为什么不对呢？

飞行2010

我感觉是A中compared 的发起者不明确，而B把ratio放到前面，很清楚compares 的对象是ratio.

gmatziyu

a ratio that compares to ****  in 1980 是同位语？怎么感觉句子未完成呢。。