Which specific problem led Rome to change from a monarchy to a republic?

A. The king did not hold enough power.

B. The king was unable to win wars.

C. The king mistreated the citizens.

D. The Senate mistreated the citizens.

A specific problem that led Rome to change from a monarchy to a republic was the king mistreated the citizens.

C. The king mistreated the citizens.

Explanation:

The Roman monarchy was overthrown around 509 BCE, during a political revolution that resulted in the expulsion of Lucius Tarquinius Superbus, the last king of Rome.

Despite waging a series of successful campaigns against Rome's neighbors, securing Rome's position as head of the Latin cities, and engaging in a series of public works, Tarquin was a very unpopular king due to his violence and abuse of power.

For this reason, we can conclude that the right answer is the letter C.