The correct answer is B) It was the first state to develop democracy.
The statement that is not true about the Roman Republic is "It was the first state to develop democracy."
The first person to refer to the term democracy as a new system was Cleisthenes, a Greek leader in Athens. So it was the Greeks the first ones that incorporated democracy to its system of government.
What indeed was true about the Roman Republic was that citizens elected representatives to rule in their name, it ruled most of the Italian Peninsula by 275 B.C., and it was replaced by the Roman Empire.