Why is voting considered to be a major responsibility of a u. s. citizen?
a. it is required for naturalization.
c. the government requires citizens to vote.
b. so that the actions of a citizen can be tracked.
d. participation is the basis of democratic government.

Voting is important so that the government
1) actually represents the people: if only a small portion of the people vote, the government will be representative only of this small number of people.

2) so that the government has the incentive to do well: to be reelected.
So the correct answer is:
d. Participation is the basis of democratic government.