After several years of rapid growth, the healthy carecompany became one of the largest health care providers in the metropolitanarea, while it then proved unable to handle the increase in business,falling months behind in its payment to doctors and hospitals.

A.   while it then proved unable to handle theincrease in business, falling months behind in its payment to

B.   while it then proved unable to handle theincrease in business and fell months behind in its payment to

C.   but then it proved unable to handle the increasein business, falling months behind in its paying

D.   but then proving unable to handle theincrease in business, falling months behind in paying

E.   but then proved unable to handle theincrease in business, falling months behind in paying

正确答案：E

记得之前在Manhattan上看过如果前后两句主语一样，不能用逗号隔开。

曼哈顿上的例句是这样的：Earl walked to school, and later ate his lunch.（错误）。如果按照这一原则，E不就不对了吗。求解答！！！