A) Direct Democracy
Explanation:
The important part of the question is that all citizens are required to vote (we can understand: in person), as opposed to only some citizens voting (this is the case when the congress votes: only some people vote on laws, and they represent the wider community).
This situation when all people vote personally and are not represented is called a direct democracy.
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D. Castro started manufacturing hydrogen bombs with the help of communist China.</span>
<em>The answer is the, The impact of the Qin Dynasty on </em>Chinese.