Answer:
D) A direct democracy
Step-by-step explanation:
A direct democracy involves the citizens of a nation voting directly on law and policy without the intermediary of a government representative. These intermediaries are included in republics and parliamentary democracies, since the citizens vote on officials to represent them, so we can eliminate choices A & B. We can also eliminate choice C since an oligarchy is defined as a small group of people (typically the elite) controlling a nation.