Sentence Correction

Among lower- paid workers, union members are less likely than non union members to be enrolled in lower- end insurance plans imposing stricter limits on medical services and requiring doctors to see more patients, and spend less time with each.

a). imposing stricter limits on medical services and requiring doctors to see more patients, and spend
b). imposing stricter limits on medical services , requiring doctors to see more patients, and spending
c). that impose stricter limits on medical services, require doctors to see more patients, and spend
d). that impose stricter limits on medical services and require doctors to see more patients, and spending
e). that impose stricter limits on medical services, requiring doctors to see more patients and spending

OA is D I just don't get it!!!

Basically you have to look for faulty parallelism and essential modifier.
That is required because we are introducing an essential modifier.
Now look at the parallelism
The plan
a) impose ...
b) require ...
c) spend less time with patients.
Now look closely again at C, a plan can not spend less time with patients, low-paid worker should...

So A & B should be parallel and include a conjunction such as and...
C need not be parallel with the rest of the sentence and the answer choices that have C parallel with A & B indicate that plan spends less time with patients

I'm pretty sure that NONE of the answers as posted are correct.

Simplyjat explained why a, b and c are wrong; however, neither d nor e is correct either.

For (d) to be correct, the "and" should be removed from the end. So, correct answer (d) should read:

that impose stricter limits on medical services and require doctors to see more patients, spending

Alternatively, we could make (e) correct by changing it to:

that impose stricter limits on medical services, requiring doctors to see more patients and spend

Until one of those two changes is made, however, the correct answer is:

(f) none of the above.

From where did you get this question?

I am confused, now. Which one is correct? None? There is no such choice!

THANK YOU STUART!!!!!

I was feeling dumb for not getting it because I thought that all of the were wrong for the exact same resons!
Thanks!

to GMAT765
The sheet had been writtem by a member of the forum, is not "approved" nor "official" material (even though had been copied from various official sources), so there might be some little error here and there!