The statement that best compares the influence of democratic and authoritarian systems of government on civil society is:
Democracies enable a strong civil society in which the people are able to influence their government, while authoritarian governments constrain civil society.
This correctly reflects the general understanding that democracies typically promote civic engagement, freedom of expression, and pluralism, allowing people to participate actively in the political process, whereas authoritarian regimes often suppress civil society and limit the avenues through which citizens can influence their government.