Ambiguous question

[er.sukantsharma]

Kate San's study, published in Nature, shows that the ancients lined up the pyramids with two stars whose alignment was only true around 4500 years ago, which makes it possible to improve the margin of error in the chronology of Egypt, from plus or minus 100 years to only five years, which makes it possible to pinpoint what people think was the start of construction of Khufu's Great Pyramid at Giza to around the year 2467 BC.

A.which makes it possible to improve the margin of error in the chronology of Egypt, from plus or minus 100 years to only five years, which makes it possible to pinpoint what people think was the start
B. which makes it impossible to stick to the margin of error in the chronology of Egypt, which was plus or minus 100 years in favor of one which is only five years, pinpointing the probable start
C. suggesting that the margin of error for the chronology of Egypt is no longer plus or minus 100 years, but rather only five years, which suggests the possibility of pinpointing the probable start
D. making improvements in the margin of error in the chronology of Egypt, from plus or minus 100 years to only five years, pinpointing the probable start
E. making it possible to improve the margin of error in the chronology of Egypt, from plus or minus 100 years to only five years, pinpointing the probable start


I was mainly confused between option (d) and option (e) but could not mark any answer as both seemed wrong. In option (d), 'making improvements' changed the complete meaning of the sentence by saying that the findings made the improvements, while in option (e), there was no antecedent of 'it'.
Could anyone please clarify it...???

[RonPurewal]

Please read the forum rules: read-before-you-post-general-verbal-folder-guidelines-t2718.html

You can't post problems in this folder without giving the original source of the problem -- i.e., the company or author that first produced the problem (= not a forum or other secondhand source).
If you don't know the original source, then i'm sorry, but you can't post the problem here.

This rule applies to MGMAT problems as well. There are over three thousand problems in our database, so we can't possibly recognize all of them.
(This is also the wrong folder for MGMAT problems, which belong in the MGMAT CAT or MGMAT non-CAT folder.)

We'll have to kill this thread within a week if the original source of the problem is not posted. Thanks.

[er.sukantsharma]

The question is from a test of 800score.com...
Hope that my problem will be sorted out..

[RonPurewal]

We actually don't accept verbal questions from that source. Check the forum rules (post9315.html) for a full list of disallowed sources.

I would recommend not using this source for verbal problems. For quant problems it may be ok, but the verbal problems from this source have consistently been problematic.
(Ideally, you should try to use verbal problems from no source other than official ones. Together, the OG's and GMAT Prep contain thousands of verbal questions, so you shouldn't really need any other sources anyway.)