prep 91正确答案不太对啊

91. The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970’s

A. extinction; its numbers are now five times greater than
                 这个选项好像不平行吧

B. extinction; its numbers are now five times more than
                

more than不如greater than

C. extinction, their numbers now fivefold what they were

D. extinction, now with fivefold the numbers they had

E. extinction, now with numbers five times greater than

选A。但是A选项than前后不平行啊