gwd-1-7(讨论答案与gmatprep答案不符)

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.

1. that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times
               
   
2. that, on average, CEO’s now earn 419 times the pay of blue-collar workers, a ratio that compares to 42 times
               
   
3. that, on average, CEO’s now earn 419 times the pay of blue-collar workers, as compared to 42 times their pay, the ratio
               
   
4. CEO’s who now earn on average 419 times more pay than blue-collar workers, as compared to 42 times their pay, the ratio
               
   
5. CEO’s now earning an average of 419 times the pay of blue-collar workers, compared to the ratio of 42 times

讨论答案都是选B。

但是在GMATprep我刚做的practice test中，这道题的答案是C. 彻底晕了？难道官方软件的答案有误？

斑竹能否分析一下正确答案的用法，其中的as短语的用法比较特别的说，谢谢！