Ans must be A. Keeps proper parallel structure intact.

B has shuttling parallel to averages. Eliminated
C has run on sentence. two ICs are joined without any conjuction. Eliminated
D has set in parallel to shuttles. Changes meaning as well. Eliminated
E has missing verb in first clause. Fragment error. Eliminated

Ans A it is!
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A. set a record in 2007 to become the fastest nonmagnetic train, which shuttles --- The comma after train is the spoil sport; the info that is cocooned between the two comma, renders that info essential. Now if you remove it, for the sake checking construction, you will find it the whole sentence is a fragment

B. set a record in 2007 to become the fastest nonmagnetic train, shuttling ---1 again the same problem a in A; 2 shuttling is not // to averages. 3. Shuttles and averages are the principal verbs; relegating them to modifier is illogical predication

C. set a record in 2007 to become the fastest nonmagnetic train, it shuttles – a run on

D. which set a record in 2007 to become the fastest nonmagnetic train, shuttles; ---because this relative clause is an additional info which can be dispensed with, the verb – set - is no more a part of the list that needs parallelism. It may be noted that the comma after the train also smugly fits in with the requirement of --, which -- . IMO, the best choice. The relative clause that describes the onetime event of the rains record- break is relegated to a modifier clause, allowing the remaining part to display the main verbs in // manner.

E. setting a record in 2007 to become the fastest nonmagnetic train; it shuttlled ------ 1 The first part is a fragment. 2. In the second part, shuttled is wrong tense and in addition, does not // averages.
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but also look that the intent of the sentence is to show the setting of the record and by putting that in comma ,as in D , we are changing the meaning of the sentence .not that i am in favour of A

TO the original poster : after putting the question u have not put the OA

my take..D

The TGV.......shuttles... correct..
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Responding to a pm:

Break down the sentence:

The TGV, - subject
France's high-speed train, - An Appositive - renames the noun right before it. We might as well ignore it
set a record in 2007 to become the fastest nonmagnetic train, - rest of the main clause
which shuttles passengers from Lorraine to Champagne-Ardenne and averages over 293 kilometers per hour (173 miles per hour) - a modifier modifying the fastest non magnetic train.

Isn't there a problem here? Obviously, the last modifier is talking about TGV and not the generic 'fastest non magnetic train'. TGV is the one which shuttles passengers from Lorraine to Champagne-Ardenne and averages over 293 kilometers per hour (173 miles per hour)

Let's look at the sentence structure of (D) now.
The TGV, which set a record in 2007 to become the fastest nonmagnetic train, shuttles passengers from Lorraine to Champagne-Ardenne and averages over 293 kilometers per hour (173 miles per hour).

Here, the main clause is 'The TGV shuttles passengers from Lorraine to Champagne-Ardenne and averages over 293 kilometers per hour (173 miles per hour).' which makes perfect sense.
'which set a record in 2007 to become the fastest nonmagnetic train,' is a modifier modifying TGV which again makes perfect sense.

As for the issue of 'which' modifying 'France's high-speed train', there is no problem here. 'which' is modifying 'train'. The possessive 'France's' just modifies the train too. The structure is absolutely fine. Take an example:

Abby's car, which is red in color, is working fine.
The sentence is correct. 'which is red in color' modifies the car.

Take another example:

This car belongs to Abby, my best friend. - Correct
This car is Abby's, my best friend. - Incorrect. This is where we are trying to modify the possessive and that is a problem.
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The appositive just renames the noun so it doesn't matter in either case. We can say that 'which' modifies TGV or 'France's high speed train' since they both refer to the same thing.



'set a record in 2007 to become the fastest nonmagnetic train' is part of the main clause and 'which' after that modifies 'the fastest nonmagnetic train'. In this case, 'shuttles passengers ... and averages ...' becomes a characteristic of the 'fastest nonmagnetic train' which is not correct. 'fastest nonmagnetic train' does not stand for TGV. In the past, some other train might have been the 'fastest nonmagnetic train'.
'shuttles passengers ... and averages ...' is a characteristic of TGV and the same should be implied by the sentence.
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Consider these sentences and tell me which one works:

Bolt set the world record in 2009 to become the fastest man, who can run 100m in 9.58 secs.
Bolt, who set the world record in 2009 to become the fastest man, can run 100m in 9.58 secs.

Logically, 'who can run' should not modify 'the fastest man' because it is not the characteristic of the fastest man. Both 'fastest man' and 'who can run 100 m in 9.58 secs' are characteristics of Bolt. It just so happens that right now, Bolt is the fastest man. Tomorrow, some one else could be the fastest man.

Anyway, you have the second option (given as D in the question) which is certainly more accurate and logical.
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