Which of the following statements is not a good argument in favour of a democracy?

Economic prosperity depends on multiple complex variables like resource distribution, historical development, economic planning, global trade, and policies—not just the system of governance. Monarchy or authoritarian states can sometimes be highly prosperous, while many developing democracies face economic hardship. Therefore, claiming that democracies are inherently more prosperous than other political systems is not considered a logically sound or universally factual argument in political science.
In contrast, options A, B, and C describe core philosophical and systemic advantages intrinsic to a democratic framework.