The correct option is C Internal peace of the country is threatened.
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During communal riots, people put community interest ahead of the country. These riots affect the unity of the nation. Due to communalism, the internal peace of the country is threatened. Communal forces often indulge in promoting their religion and denouncing other religions. They tend to increase the feelings of communalism among their co-religionists. Communalism is a hindrance to the progress of society, state, and nation.