Why Do Many Citizens Choose to Vote Despite the Inconvenience

Why do many citizens choose to vote despite the inconvenience or relative insignificance of a single vote?

A) Many cities charge higher taxes to those who do not vote.
B) Their jobs require them to participate in the political process.
C) They are required by law to vote.
D) They have been paid to cast their vote for a particular candidate.
E) They view it as a responsibility of citizenship.