D because :
1. Uses past perfect tense to define a sequential activity.
2. Correct modifier usage.
3. 'Which' rightly justifies the noun immediately before it.
Sent from my Micromax E481 using GMAT Club Forum mobile app
1. Uses past perfect tense to define a sequential activity.
2. Correct modifier usage.
3. 'Which' rightly justifies the noun immediately before it.
Sent from my Micromax E481 using GMAT Club Forum mobile app



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