Concept:Social justice means the state must create a fair society where all citizens are treated equally.Explanation:Social justice focuses on equality, fairness, and protection of rights for every citizen.It requires the state to remove discrimination and ensure equal access to opportunities and resources.Among the given options, equality of citizens is the core idea of social justice.Sharing power, protecting multinational businesses, and fairness to foreigners are not its main demands.Answer:C. equality of citizens