A. set a record in 2007 to become the fastest nonmagnetic train, which shuttles
B. set a record in 2007 to become the fastest nonmagnetic train, shuttling
C. set a record in 2007 to become the fastest nonmagnetic train, it shuttles
D. which set a record in 2007 to become the fastest nonmagnetic train, shuttles
E. setting a record in 2007 to become the fastest nonmagnetic train; it shuttled
Confused between options A and D.
Please explain.


















