Final answer:
The right to vote gives both the right and the civic duty to participate in a democracy.
Step-by-step explanation:
The idea that gives both the right and the civic duty to participate in a democracy is the right to vote (option D). The right to vote is a fundamental right that allows citizens to have a voice in the political processes and decision-making of their country. It is not only a right but also a civic duty because it is the primary way that people express their will and contribute to the democratic process.