The philosopher who wrote The Republic was:
C) Plato
The Republic is a Socratic dialogue, concerning justice , the order and character of the just city-state, and the just man.
In the dialogue, Socrates discusses with various Athenians and foreigners about the meaning of justice and whether the just man is happier than the unjust man. They consider the natures of existing regimes and then propose a series of different, hypothetical cities in comparison, culminating in Kallipolis a city-state ruled by a philosopher king.