Traffic safety officials predict that drivers will be equally likely to exceed the proposed speed

limit as the current one.

A.     equally likely to exceed the proposed speed limit as

B.     equally likely to exceed the proposed speed limit as they are

C.     equally likely that they will exceed the proposed speed limit as

D.     as likely that they will exceed the proposed speed limit as

E.      as likely to exceed the proposed speed limit as they are.

答案是E,我想问问D错在哪里呢，请NN指教