SAT语法题（10.26）( Rarely has funeral procession been as moving

SAT语法题（10.26）
( Rarely has funeral procession been as moving to the public as was the cortege that accompanied John F.Kennedy to his final resting place.)
A.Rarely has funeral procession been as moving to the public as was the cortege that accompanied John F.Kennedy to his final resting place.
B.It was rare that there was a funeral procession that was as moving to the public as the cortege that accompanied John F.Kennedy to his final resting place.
C.A funeral procession was very rare as the cortege that moved the public as it accompanied John F.Kennedy to his final resting place.
D.Rarely has there ever been any funeral procession moving the public that finally accompanied John F.Kennedy to his final resting place
E.Rarely has a funeral procession been so publicly moving as the cortege that had been accompanying John F.Kennedy to his final resting place
好冗长啊.怎么分析啊?