National Science Foundation

[okigbo]

According to the National Science Foundation, in 2003 there were 198,113 female science and engineering graduate students, almost 42% of the graduate students in those fields, [b]twice as much as 1981[/b].

twice as much as 1981

twice as many as 1981

double the figure for 1981

double what it was in 1981

a number double that of 1981's

[gmatv09]

IMO C

options A&B incorrect comparisons
options D - 'it' doesn't have correct ref
option E - 1981's awkward