Answer:
C. The people have a voice in the government.
Explanation:
However, this entirely depends on what kind of democracy is in question. The answer C., answers the question if it prioritizes direct democracy over any other, in that the people have direct control of the government and individually can vote for propositions they want or disagree with.
B, can be correct if it is not true democracy, in that it is in human nature in which they would follow what is known as the "elite class". In this case, the government would benefit those who back it, typically with money, as well as power in it of itself, and the government would work towards pushing for benefits for their groups rather than the general public. Both sides of the political spectrum does this.
A & D are both incorrect, as a king is an absolute leader, and both controls all political decisions that occur within the nation.