A recent New York Times editorial criticized the city's election board for, first of
all, failing to replace outmoded voting machines prone to breakdowns, and
secondarily, for their failure to investigate allegations of corruption involving
board members.
(A) secondarily, for their failure to
(B) secondly, for their failure to
(C) secondly, that they failed and did not
(D) second, that they failed to
(E) second, for failing to

IMO (E)

idiomatic

OA not provided