* SC

[technorashmi]

7. Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect its alreadytattered image, and increase its ability to buy bond insurance.
(A) Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect
(B) To obtain an investment-grade rating will keep the county's future borrowing costs low, and protect
(C) Having obtained an investment-grade rating will, in keeping the county's future borrowing costs low, protect
(D) To obtain an investment-grade rating would keep the county's future borrowing costs low, protecting
(E) Obtaining an investment-grade rating, keeping the county's borrowing costs low, would be protecting

My doubt is how to handle this type of sentences and why use of infinitives is incorrect in this sentence

[saptadeepc]

7. Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect its alreadytattered image, and increase its ability to buy bond insurance.
(A) Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect
(B) To obtain an investment-grade rating will keep the county's future borrowing costs low, and protect
(C) Having obtained an investment-grade rating will, in keeping the county's future borrowing costs low, protect
(D) To obtain an investment-grade rating would keep the county's future borrowing costs low, protecting
(E) Obtaining an investment-grade rating, keeping the county's borrowing costs low, would be protecting

My doubt is how to handle this type of sentences and why use of infinitives is incorrect in this sentence

Is the OA 'A' ?

I can reason if it is 'A'

[RonPurewal]

hi --

did you see this problem in the official GMAT PREP SOFTWARE?
if not, you can't post it here. (this problem is in the OG verbal supplement -- a source from which GMAC has explicitly asked us not to post problems for copyright reasons -- so we have to be very careful here.)

if a screenshot from the official software is not posted in the next 3-5 days, we will delete this thread. thanks.