Step-by-step explanation:
B. Democracy involves a delicate balance between freedom and rules because rules keep people safe but freedom allows for extraordinary opportunity.
Option B would make a solid thesis for Marco's essay as it provides a clear argument and highlights the key aspects of democracy. It acknowledges the importance of rules in maintaining safety and order, while also recognizing the value of freedom in creating opportunities for individuals. Additionally, it does not make any extreme claims or generalizations, making it a well-balanced and reasonable thesis statement.