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C。请问下B错误的原因是否是因为a ratio that compares to...里面compare没有用被动，而ratio本身不可以自己去compare呢？另外想请教下C选项中CEO's now earn 419 times the pay of blue-collar workers中动词是否是earn呢？那CEO后面为什么要加‘s呢？请nn指教下：）