Some historians estimate that in the Great Chicago Fire of 1871, twice as much acreage was destroyed than had earlier been ravaged in Napoleon ’ s Moscow burnings of 1812 and the Great Fire of London of 1666 combined.
a) than had earlier been
b) than the amount that was earlier
c) over the amount that was previously
d) as had earlier been
e) as was
OA is D.
What is wrong with E here? the time-perioed is clearly mentioned so why simple past is not appropriate? why to use past perfect?