GMAT Sentence Correction (SC) | Re: 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 notso much to a sense of history among ourpoliticians than it reflects their
Wrong. "so X than Y quot; is wrong comparison.

B. testifying less to a sense of history among our ploiticians than it reflects their
Wrong.
...

---