Ithink its a or b!

which of the following statements best describes a person’s accomplishments following the résumé writing guidelines?
a.
coordinated school’s student-body elections and reduced final ballot processing time by 30%
b.
my duties included organizing the student-body elections and processing ballots
c.
i was in charge of the school’s student-body elections and ballot processing
d.
processed a lot of ballots quicker than the previous year