Of all the vast tides of migration that have swept through history, maybe none is more concentrated as the wave that brought 12 million immigrants onto American shores in little more than three decades.

 

(A) maybe none is more concentrated as

 

(B) it may be that none is more concentrated as

 

(C) perhaps it is none that is more concentrated than

 

(D) maybe it is none that was more concentrated than

 

(E) perhaps none was more concentrated than

大家来讨论一下，这题怎么样？