请教一道语法，出现在GWD和prep的总结里

32. 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

我记得在gwd里选B  个人觉得b符合同位语修饰的习惯，可prep总结里答案为c,请大虾指点。

我觉得C不对，their很不清楚。而且后面的the ratio指代419 times 还是 42 times都很不清楚！再有as的用法，谁是主语，罩语法来说有可能是ceo's 有可能是 workers，但是逻辑意思应该是前面的那个ratio。这么多错误，C怎么会对呢

尝试解释一下：

DE不用说了，B由于compare没有用被动时也不说了，剩下AC

C用42 times their pay和419 times the pay of blue-collar workers作对比，最后一个a ratio是42times的同位语，解释说明补充。

A似乎如果能在workers后面补上do就好了，指代earn