Concept:Direct democracy means citizens make decisions directly on policies rather than through elected representatives.
Explanation:Switzerland is the country that operates a direct democracy.
In this system, citizens vote directly on laws, policies, and important national issues.
For example, Swiss citizens regularly participate in referendums and popular initiatives.
Russia, the United Kingdom, and the United States use representative democracy.
In those countries, citizens elect officials to make decisions for them.
Direct democracy is not the principal governing system in those nations.
Thus, among the options given, Switzerland best matches the practice of direct democracy.
Answer:D. Switzerland