GMAT Sentence Correction (SC) | In a process that has become de rigueur

In a process that has becomede rigueur following the end of every presidency, presidential libraries are sprouting up like carbuncles all over the land,testifying not so much to a sense of history among our politicians than it reflects their unbridled vainglory.

A. testifying not so much to a sense of history among our politicians than it reflects their
B. testifying less to a sense of history among our ploiticians than it reflects their
C. not so much testifying to a sense of history among
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