Final answer:
According to the Constitution, people are active participants in decision-making through voting and representation, which aligns with choice C.
Step-by-step explanation:
The role that the people play in a country's political processes according to the Constitution is C. Active participants in decision-making through voting and representation. This includes choosing their leaders, voting on legislation, and serving on juries. The Constitution establishes a democratic system where the governance is based on the consent of the governed and provides mechanisms such as elections, the power to petition, and freedom of speech to ensure that citizens have meaningful ways to influence political affairs. The participatory nature of democracy is aimed to ensure that elected officials are accountable to the people they represent.