<span>The feature a nation must have to be considered a democracy is- citizen.</span>
Answer: 1. Statistics.
2. Population
3. Sample
Explanation:
1. The branch of mathematics which deals with how data is collected, organized, presented, analysed, and interpreted is statistics.
2. The complete collection of all elements to be studied is Population.
3. The subset of a population that will serve as a representative of the whole population is Sample.
B is the answer to your question
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