Plz hurry which of these sentences might best express the main idea of a speech to persuade people to vote?

a) people ages 18 to 24 years old vote less often than any other age range.

b) in a democracy, it is a duty and privilege to vote for governmental leaders.

c) voting would be much easier if the system was the same throughout the country.

d) in america, more people vote in federal elections than in state or local elections.