difficult Grammar qusestion

szbill

The books of W.E.B. DuBois before World War I constituted as fundamental a challenge to the accepted ideas of race relations that, two generations later will be true of  the writings of the radical writers of the 1960’s.
A)        that, two generations later will be true of
B)        that, two generations later, would be true of
C)        as, two generations later , would be true of
D)        as, two generations later, would
E)        just in the way that, two generations later, did
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szbill

answer is D.