comparison

[sarahfzq]

According to public health officials, in 1998 Massachusetts became the first state in which more babies were born to women over the age of thirty than under it.


A.than
B.than born
C.than they were
D.than there had been
E.than had been born

OA is A, why C is not right?

Thanks

[RonPurewal]

According to public health officials, in 1998 Massachusetts became the first state in which more babies were born to women over the age of thirty than under it.


A.than
B.than born
C.than they were
D.than there had been
E.than had been born

OA is A, why C is not right?

Thanks

* This is a GMAT Prep problem. It doesn't belong in this folder.

* Please search the forum; there are existing threads on this problem.
Please read those threads, as your question(s) is/are almost certainly answered in them.
If not, please post your questions in the existing threads. Don't start a new thread.

* If you post, please give specifics of your thought process so far.
What do you already understand about choice C?
What, specifically, is the part of choice C with which you have an issue?

Thanks.