= E

Option A and B has modifier "Which". which modifies the noun just before "which". Hence in this case which is modifying "4500 years ago" hence wrong

In Option C "margin of error for the archaeological chronology " is wrongly worded .... instead of for there must be "in"
Also, "rather only five years, which suggests the possibility of pinpointing".....which is modifying five years, that is sense less

Option D is changing the meaning of the original sentence. According to the sentence it is possible to improve the margin in chronology, .... possible but not definite
by removing the word POSSIBLE in option D ..it suggests that it definite to improve .... hence alter intent and wrong

Option E .... both the clauses are starting with -ing ..hence correctly modifying previous clause .... correct FROM X TO Y idiom ....also shows possibility of the event ....hence correct.
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E. was confused between C & E . eliminated all the others because which after 4500yrs was not appropriate (reasons stated in previous posts). In C again the usage of which was not appropriate. As a general rule which must modify the noun immediately preceding it and the whole clause.

Thanks Nice explanation.. really helps
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Got confused between C and E. Finally eliminated C because of the present tense present.
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FOCUS..this is all I need!

Ku-Do!

I get confused with the options when option mentions .. "it"..what does it refer to in statement E?

+1 for (E)
The original sentence is incorrect because WHICH after 4500 YEARS is not modifying the STUDY.
POE works,(C) has ...BUT RATHER.. which looked awkward.
(D)vs(E), WHICH in the second sentence is the determining factors, so (E) wins.
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I have seen lots of such long SC questions appearing in Real GMAT exam and they are
1) really very time consuming
2) difficult to interpret the meaning
3) force to re-read the original sentence (with different options) again and again.

Is there a quick way/Trick to solve such long questions ?
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Break them into fragments, look for SV pairs, Modifiers, check out ICs. etc... e-gmat methods will suit you.
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Kate San's study, published in Nature, shows that the ancients lined up the pyramids with two stars whose alignment was only true around 4,500 years ago,which makes it possible to improve the margin of error in the archaeological chronology of ancient Egypt, from plus or minus 100 years to only five years, which makes it possible to pinpoint what people probably 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 archaeological chronology of ancient Egypt, from plus or minus 100 years to only five years, which makes it possible to pinpoint what people probably think was the start First "which" modifying 4500 years instead of alignment

B) which makes it impossible to stick to the margin of error in the archaeological chronology of ancient Egypt, which was plus or minus 100 years in favor of one which is only five years, pinpointing the probable start same error as "A" and distorted meaning

C) suggesting that the margin of error for the archaeological chronology of ancient Egypt is no longer plus or minus 100 years, but rather only five years, which suggests the possibility of pinpointing the probable start usage of rather is wrong it should be "rather than" and tense "suggesting" is incorrect it should be suggested

D) making improvements in the margin of error in the archaeological chronology of ancient Egypt, from plus or minus 100 years to only five years, pinpointing the probable start "making improvements " wrongly suggesting that that study itself making improvements which distorts the meaning of the sentence

E) making it possible to improve the margin of error in the archaeological chronology of ancient Egypt, from plus or minus 100 years to only five years, pinpointing the probable start clarity in meaning and parallelism in maintained





Please explain.[/quote]
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