The correct answer is:
B. Citizens choose the government's leaders in democracies, but have no role in choosing leaders in autocracies.
In democracies, citizens typically have the right to vote and participate in the electoral process to choose their leaders and influence government policies. In contrast, in autocracies, citizens often have little to no genuine participation in the decision-making process, and leaders are typically selected through non-democratic means, such as appointment or hereditary succession, rather than free and fair elections.