GMAT GWD SC题一道,According to a survey of graduating medical s

GMAT GWD SC题一道,
According to a survey of graduating medical students conducted by the Association of American Medical Colleges,_________________in socioeconomically deprived areas.
a.minority graduates are nearly four times more likely than are other graduates in planning to practice
e.it is nearly four times as likely for minority graduates than other graduates to plan to practice
why a instead of