Sentence Correction

Question 105 from OG11

1. Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, is finding uses in medicine, archaeology, and criminology.
(A) Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it,
(B) Originally developed for detecting air pollutants, having the ability to analyze the chemical elements in almost any substance without destroying it, a technique called proton induced x-ray emission
(C) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it,
(D) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which has the ability to analyze the chemical elements in almost any substance quickly and without destroying it,
(E) A technique that was originally developed for detecting air pollutants and has the ability to analyze the chemical elements in almost any substance quickly and without destroying the substance, called proton-induced x-ray emission,

Answer :A

Could the Instructors please explain the usage of 'which' in A) , is it modifying 'Emission' or 'Technique'. I read 'which' modifies immediate preceding noun ('emission' in this question) but will it not make the answer incorrect then?

which modifies the noun/pronoun/(whatever) that is immediately preceding the comma.
(though we have seen some exceptions in this)
but most of the time it works.

Conider in ths case, a technique cannot quikly analyse the chemical elements. proton-induced x-ray emission - can analyse elements.

Same as "refers to" - seen somewhere in OG.

SO A. [it properly places the modifier, rest misplace the modifiers)

hey

Thanks for your reply. But I am not too sure if I understood it. Could you explain it once more in more simpler terms?

thanks

KSR wrote:Question 105 from OG11

1. Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, is finding uses in medicine, archaeology, and criminology.
(A) Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it,
(B) Originally developed for detecting air pollutants, having the ability to analyze the chemical elements in almost any substance without destroying it, a technique called proton induced x-ray emission
(C) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it,
(D) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which has the ability to analyze the chemical elements in almost any substance quickly and without destroying it,
(E) A technique that was originally developed for detecting air pollutants and has the ability to analyze the chemical elements in almost any substance quickly and without destroying the substance, called proton-induced x-ray emission,

Answer :A

Could the Instructors please explain the usage of 'which' in A) , is it modifying 'Emission' or 'Technique'. I read 'which' modifies immediate preceding noun ('emission' in this question) but will it not make the answer incorrect then?

here in this case the technique's name is "proton-induced x-ray emission" so "which" refers to the technique.. "proton-induced x-ray emission" gives a detail about the technique i.e. its name.

Can you please tell...which modifies...

1. technique or
2. Proton induced x-ray emmission.

in this question, gmat wants to test us how to arrange 2 modifier. 2 modifier should not be put together. they should be put preceding and following the their headword. that is why A is correct.