The correct answer is D, <em>elect leaders to represent them in government</em>.
Explanation:
A Republic is a political regime where the political leader is chosen not because of hereditary issues, that is not because he/she is somebody's son/daughter but because there was an election to choose a representative.
The keyword to understand a Republic government is representation. It means that in this government people have a voice that is concretized in a representative chosen by them.
However, that doesn't mean this regime is fully democratic. The other options for this question refer to democratic tools that governments can use constantly or almost never depend on how much they value democratic participation.
