The correct responses regarding how Rome's common people reacted to their problems are:
- They refused to repay their debt and reclaimed any land they had lost.
- They left Rome and built their own city.
- They refused to fight in the army.
- They banded together, called themselves plebeians, and demanded political power.
Each of these actions reflects the plebeians' responses to their grievances during periods of social and economic distress in ancient Rome.